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Buying Guide

Best Under Sink Shelf Inserts for Trustworthy Size Fields

The deciding specification is what each dimension field is actually measuring, because two of these five fill all three slots with the shelf's own size, two fill a slot with one end of an adjustment range, and on one of them no field is a measurement of the shelf at all.

By the Lush Editorial Team·Researched & Compared

  • Researched & ComparedSpecs pulled from the manufacturer listing
  • Like-for-LikeSame measures across every model
  • No Paid PlacementsNobody pays to appear here

I read all three dimension fields on each listing against every figure the same maker publishes in its title, its size row and its bullets, across five under sink shelf inserts, using nothing but the listings' own text.

Our Shortlist

Same Numbers. A Clearer Choice.
Best for a stated cabinet size you can check first
VEVOR Pull Out Cabinet Organizer

VEVOR Pull Out Cabinet Organizer

The only listing of the five to publish two complete triples and say which is which. Its first bullet gives a product size of 12 by 21 by 15.2 inches and a cabinet installation size of 13.5 by 22 by 19 inches, and its three dimension fields carry the first set exactly. Its size row repeats the product figures a third time with each axis labeled, so the same measurement appears in three places and never changes. Nothing on this listing adjusts, which is why none of its figures is one end of a range, and it is the only one of the five to publish a weight, at 13.23 lb. It holds up to 60 lbs, is chrome plated steel, assembles in four steps, installs on the left or the right side, has movable dividers and non slip bottom pads, and warns in the same bullet to check for door hinges and pipes before measuring. No washing instruction beyond calling the surface easy to clean.

  • 12"W x 21"Dx15.2"H
  • 13.23 lb
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Best for seeing both ends of the height adjustment
GeeBom Under Sink Organizer 2 Pack

GeeBom Under Sink Organizer 2 Pack

The one listing here that writes an adjustment range into the size row itself: a width of 11.8 inches, a depth of 15.9 inches and a height of 13.8 to 16.9 inches. Its first bullet repeats all four of those figures and prefaces them with the word approximately, which is a more careful statement than most of this category manages. The height field then keeps 16.9 inches, the top of the range, so a buyer reading the field alone would never learn the shelf also sits at 13.8 inches. Read the row and that problem goes away, which is the argument for picking this one if cabinet height is your tight dimension. It is a two pack with an L shaped frame built to pass around a drain pipe and a custom cut silicone mat under it, described as waterproof. No weight, no load figure and no washing route appears anywhere on the listing.

  • 11.8"W x 15.9"D x 13.8-16.9"H
  • (not listed)
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Best for a size row that names every axis
KOSIWU Expandable Under Sink Organizer

KOSIWU Expandable Under Sink Organizer

The size row reads as a depth of 9.45 inches, a width of 32 inches and a height of 16.5 inches, with each axis written out in words next to its figure. The three dimension fields hold those same three numbers. That is rarer than it should be: two of the five listings on this page put a single adjective in that slot instead, so a labeled triple is worth more than its two decimals suggest. Its depth field reads 9.45 inches, against 11.22 inches for GEMWON, 15.9 inches for GeeBom and 21 inches for VEVOR, which makes this the one to read if the cabinet floor is crowded. The limitation is everything else. Its five bullets contain no measurement at all, it is called expandable and adjustable in height with no range published for either, and no load figure, no weight and no washing instruction appears. The row is the whole specification.

  • 9.45 inches (D) x 32 inches (W) x 16.5 inches (H)
  • (not listed)
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Best for a wide cabinet with a pipe in the way
Under Sink Organizer and Storage 16.5"-30.7" Expanda...

Under Sink Organizer and Storage 16.5"-30.7" Expanda...

A single word in the size row and the most figures in a bullet of anything here. It publishes a fixed width of 11.2 inches restated as 28.5 centimeters, an expandable length of 16.5 to 30.7 inches, an adjustable height of 13.19 to 16.73 inches, and a maximum and minimum overall size. Set that against its fields and each of the three follows a different rule: the width field reads 16.54 inches, which is the bottom of the length range, the depth field reads 11.22 inches, which is the fixed width, and the height field reads 16.73 inches, which is the top of the height range. The slot labeled width holds a length. Its title then advertises a maximum height of 16.7 inches instead. Beyond the size it publishes removable side panels to bypass a U bend, eight ABS panels at 11 by 6.3 inches, four rails, twelve screws, two wrenches, a 0.5mm frame, a 50 lbs load per tier, assembly in 10 mins and hand washing only.

  • Large
  • (not listed)
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Best if you will measure the cabinet yourself
Under Sink Organizer

Under Sink Organizer

The size row is the word Small and the listing publishes no measurement of the assembled shelf in any sentence. What it does publish, all in one bullet, is three figures that describe other things: cabinets with an interior length of 12 to 19.6 inches, an adjustment from 11.3 to 15 inches high, and a base it publishes at 3.07 inches. Each of those turns up in a dimension field where it does not belong. The depth field reads 3.07 inches, which is the base. The height field reads 16.73 inches, above the 15 inch ceiling the same bullet gives. The width field reads 19.68 inches, and the only figure near it on the listing is that 19.6 inch cabinet interior. So no field here is a published measurement of this shelf, and the maker's own sentences are the only usable source. It holds 52 lbs, has a powder coated heavy duty frame, and offers three fixing options including adhesive strips and a rails only setup that slides side to side.

  • Small
  • (not listed)
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Side by Side Comparison

ModelBrandSize (Capacity)WeightBest For
VEVOR Pull Out Cabinet Organizer VEVOR 12"W x 21"Dx15.2"H 13.23 lb Best for a stated cabinet size you can check first
GeeBom Under Sink Organizer 2 Pack GeeBom 11.8"W x 15.9"D x 13.8-16.9"H Not listed Best for seeing both ends of the height adjustment
KOSIWU Expandable Under Sink Organizer KOSIWU 9.45 inches (D) x 32 inches (W) x 16.5 inches (H) Not listed Best for a size row that names every axis
Under Sink Organizer and Storage 16.5"-30.7" Expanda... GEMWON Large Not listed Best for a wide cabinet with a pipe in the way
Under Sink Organizer Aisslro Small Not listed Best if you will measure the cabinet yourself

Each Pick in Detail

1 Best for a stated cabinet size you can check first
VEVOR Pull Out Cabinet Organizer

VEVOR Pull Out Cabinet Organizer

The only listing of the five to publish two complete triples and say which is which. Its first bullet gives a product size of 12 by 21 by 15.2 inches and a cabinet installation size of 13.5 by 22 by 19 inches, and its three dimension fields carry the first set exactly. Its size row repeats the product figures a third time with each axis labeled, so the same measurement appears in three places and never changes. Nothing on this listing adjusts, which is why none of its figures is one end of a range, and it is the only one of the five to publish a weight, at 13.23 lb. It holds up to 60 lbs, is chrome plated steel, assembles in four steps, installs on the left or the right side, has movable dividers and non slip bottom pads, and warns in the same bullet to check for door hinges and pipes before measuring. No washing instruction beyond calling the surface easy to clean.

  • Two complete triples published and labeled, the product at 12 by 21 by 15.2 inches and the cabinet at 13.5 by 22 by 19
  • The three dimension fields carry the product figures exactly
  • The only weight on the page, 13.23 lb, and a load figure of 60 lbs
  • Nothing adjusts, so a cabinet outside 13.5 by 22 by 19 inches rules it out
  • No washing instruction beyond calling the surface easy to clean
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2 Best for seeing both ends of the height adjustment
GeeBom Under Sink Organizer 2 Pack

GeeBom Under Sink Organizer 2 Pack

The one listing here that writes an adjustment range into the size row itself: a width of 11.8 inches, a depth of 15.9 inches and a height of 13.8 to 16.9 inches. Its first bullet repeats all four of those figures and prefaces them with the word approximately, which is a more careful statement than most of this category manages. The height field then keeps 16.9 inches, the top of the range, so a buyer reading the field alone would never learn the shelf also sits at 13.8 inches. Read the row and that problem goes away, which is the argument for picking this one if cabinet height is your tight dimension. It is a two pack with an L shaped frame built to pass around a drain pipe and a custom cut silicone mat under it, described as waterproof. No weight, no load figure and no washing route appears anywhere on the listing.

  • The height adjustment is written into the size row itself, 13.8 to 16.9 inches
  • The first bullet repeats all four figures and says approximately
  • An L shaped frame to pass a drain pipe and a cut silicone mat underneath
  • The height field keeps only 16.9 inches, the top of the range
  • No load figure, no weight and no washing route is published
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3 Best for a size row that names every axis
KOSIWU Expandable Under Sink Organizer

KOSIWU Expandable Under Sink Organizer

The size row reads as a depth of 9.45 inches, a width of 32 inches and a height of 16.5 inches, with each axis written out in words next to its figure. The three dimension fields hold those same three numbers. That is rarer than it should be: two of the five listings on this page put a single adjective in that slot instead, so a labeled triple is worth more than its two decimals suggest. Its depth field reads 9.45 inches, against 11.22 inches for GEMWON, 15.9 inches for GeeBom and 21 inches for VEVOR, which makes this the one to read if the cabinet floor is crowded. The limitation is everything else. Its five bullets contain no measurement at all, it is called expandable and adjustable in height with no range published for either, and no load figure, no weight and no washing instruction appears. The row is the whole specification.

  • Every axis in the size row is labeled in words beside its figure
  • The three dimension fields match the row at 32, 9.45 and 16.5 inches
  • A depth field of 9.45 inches, against 15.9 inches for GeeBom and 21 for VEVOR
  • Called expandable and adjustable in height with no range published for either
  • No measurement appears in any of its five bullets
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4 Best for a wide cabinet with a pipe in the way
Under Sink Organizer and Storage 16.5"-30.7" Expanda...

Under Sink Organizer and Storage 16.5"-30.7" Expanda...

A single word in the size row and the most figures in a bullet of anything here. It publishes a fixed width of 11.2 inches restated as 28.5 centimeters, an expandable length of 16.5 to 30.7 inches, an adjustable height of 13.19 to 16.73 inches, and a maximum and minimum overall size. Set that against its fields and each of the three follows a different rule: the width field reads 16.54 inches, which is the bottom of the length range, the depth field reads 11.22 inches, which is the fixed width, and the height field reads 16.73 inches, which is the top of the height range. The slot labeled width holds a length. Its title then advertises a maximum height of 16.7 inches instead. Beyond the size it publishes removable side panels to bypass a U bend, eight ABS panels at 11 by 6.3 inches, four rails, twelve screws, two wrenches, a 0.5mm frame, a 50 lbs load per tier, assembly in 10 mins and hand washing only.

  • A fixed width, a length range, a height range and both overall sizes all published in one bullet
  • The fixed width is given in both units, 11.2 inches and 28.5 centimeters
  • A full parts list, eight ABS panels at 11 by 6.3 inches, four rails, twelve screws and two wrenches
  • The width field holds 16.54 inches, which is the bottom of its length range
  • The title says a maximum height of 16.7 inches and the bullet says 16.73
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5 Best if you will measure the cabinet yourself
Under Sink Organizer

Under Sink Organizer

The size row is the word Small and the listing publishes no measurement of the assembled shelf in any sentence. What it does publish, all in one bullet, is three figures that describe other things: cabinets with an interior length of 12 to 19.6 inches, an adjustment from 11.3 to 15 inches high, and a base it publishes at 3.07 inches. Each of those turns up in a dimension field where it does not belong. The depth field reads 3.07 inches, which is the base. The height field reads 16.73 inches, above the 15 inch ceiling the same bullet gives. The width field reads 19.68 inches, and the only figure near it on the listing is that 19.6 inch cabinet interior. So no field here is a published measurement of this shelf, and the maker's own sentences are the only usable source. It holds 52 lbs, has a powder coated heavy duty frame, and offers three fixing options including adhesive strips and a rails only setup that slides side to side.

  • A cabinet interior length of 12 to 19.6 inches is published
  • A height adjustment of 11.3 to 15 inches is published
  • A load figure of 52 lbs and a powder coated heavy duty frame
  • No measurement of the assembled shelf appears in any sentence
  • The depth field holds 3.07 inches, which the maker calls the base
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Our Verdict

VEVOR labels two triples and its fields carry the product one, 12 by 21 by 15.2 inches. GeeBom writes its height as a range and its field keeps the top, 16.9 inches. GEMWON's three fields turn out to be the bottom of its length range, its fixed width and the top of its height range. KOSIWU labels every axis in its size row. Aisslro's three fields are a base, a cabinet figure and a number above its own stated ceiling.

“A field figure is worth something only if a sentence repeats it.”

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What Separates These Five

Two triples, both labeled VEVOR publishes a product size of 12 by 21 by 15.2 inches and a cabinet size of 13.5 by 22 by 19 inches, and its fields carry the first.
The range is in the row GeeBom writes a height of 13.8 to 16.9 inches into the size row. Its height field keeps 16.9, the top end only.
Three slots, three rules GEMWON's width field is the bottom of its length range, its depth field is its fixed width, its height field is the top of its height range.
A base in the depth slot Aisslro publishes 3.07 inches as the height of its base. That is exactly what its depth field holds, and the shelf's own depth is nowhere.
One figure, two brands The height field reads 16.73 inches on GEMWON and on Aisslro. GEMWON's range ends there. Aisslro's own ceiling is 15 inches.

How We Chose

Figures in the size row
Every axis labeled in the row
A measurement repeated in the maker's own sentences
All three dimension fields filled
A load figure published
A separate cabinet figure published

Frequently Asked Questions

Why would a dimension field not describe the product?+

Because somebody has to type a number into it and nothing checks which number. On Aisslro the depth field reads 3.07 inches, and the maker's own bullet calls 3.07 inches the low profile base, so the slot holds a part rather than the whole. Its height field reads 16.73 inches while the same bullet caps the adjustment at 15 inches. Read the sentences and the fields separately, and believe the sentences.

If a shelf adjusts, which figure ends up in the field?+

Whichever end the seller chose, and the field never says. GeeBom publishes a height of 13.8 to 16.9 inches in its size row and its height field keeps 16.9, the top. GEMWON publishes a length of 16.5 to 30.7 inches and its width field keeps 16.54, the bottom. Two listings, two opposite choices, and neither field is wrong so much as incomplete.

What does it mean when two brands publish the same figure?+

That it probably came from a template rather than a tape measure. GEMWON and Aisslro both carry 16.73 inches in the height field, and the two listings share nothing else. On GEMWON it is right, because its published height range ends at 16.73 inches. On Aisslro the same number contradicts its own stated maximum of 15 inches. A shared figure is a reason to look for a sentence that confirms it.

Which of these tells me what cabinet I need?+

Two of them. VEVOR publishes a cabinet installation size of 13.5 by 22 by 19 inches beside its own product size of 12 by 21 by 15.2 inches, both labeled in one bullet. Aisslro publishes an interior cabinet length of 12 to 19.6 inches. GEMWON does not give a cabinet figure but spends a whole bullet telling you to measure the inner width, height and depth and to account for the drainpipe.

Is a labeled size row better than a filled dimension field?+

It is better than an unlabeled one, because the listing's three fields do not say which axis each belongs to. KOSIWU writes its row as a depth of 9.45 inches, a width of 32 inches and a height of 16.5 inches, with the axis named beside each figure. VEVOR does the same. The two listings that put a single word in the row are also the two whose fields need the most work to interpret.

How much depth do these take from the cabinet floor?+

KOSIWU publishes 9.45 inches, GEMWON publishes 11.22 inches in the field and a fixed width of 11.2 inches in words, GeeBom publishes 15.9 inches and VEVOR publishes 21 inches. Aisslro publishes no depth for the unit at all, only a 3.07 inch base, so there is no figure to compare. The gap between 9.45 inches and 21 inches is wide enough to decide the purchase on its own.

Specifications come from the manufacturers' own published listings. Lush Food & Drink may earn a commission if you buy through a link on this page, at no extra cost to you. How we research.

How the Five Compare on the Numbers

Every one of these five fills all three dimension fields, and that is where the agreement ends. Two of the five fill them with the shelf’s own overall size. Two fill at least one slot with one end of an adjustment range, which is a real figure describing a position rather than an object. On the fifth, no field survives a reading of the maker’s own sentences.

Three publish a load figure and only one publishes a weight. Three publish a height that adjusts, and each of those three resolves it differently in the field: one keeps the top, one keeps the top of a different range than its title advertises, and one keeps a figure above its own stated ceiling. Two publish a separate measurement for the cabinet.

Specification VEVOR GeeBom KOSIWU GEMWON Aisslro
What the size row holds Three figures, each labeled Three figures, one a range Three figures, each labeled The word Large The word Small
Width field 12 inches 11.8 inches 32 inches 16.54 inches 19.68 inches
Depth field 21 inches 15.9 inches 9.45 inches 11.22 inches 3.07 inches
Height field 15.2 inches 16.9 inches 16.5 inches 16.73 inches 16.73 inches
Size in the maker’s own words 12 by 21 by 15.2 inches 11.8 by 15.9 inches, height 13.8 to 16.9 not published Max 30.7 by 11.2 by 16.73 inches not published
Height range published not published 13.8 to 16.9 inches not published 13.19 to 16.73 inches 11.3 to 15 inches
Length range published not published not published not published 16.5 to 30.7 inches not published
A cabinet figure published separately 13.5 by 22 by 19 inches not published not published not published Interior length 12 to 19.6 inches
Load figure published 60 lbs not published not published 50 lbs per tier 52 lbs
Weight field 13.23 lb not published not published not published not published
Parts counted out in the listing not published not published not published Eight panels, four rails, twelve screws not published
Washing route published not published not published not published Hand washing only not published

What the table hides is that two of these height fields carry the same figure, 16.73 inches, on listings from unrelated brands with nothing else in common. One of the two publishes a range that ends there. The other publishes a range that ends at 15 inches, so for that listing the field is a number the maker’s own sentences do not support, and nothing in the table marks it as different from the rest.

Where a Field Is Simply the Product

Two Triples, Both Labeled

VEVOR is the only listing of the five that publishes two complete measurements and says which is which. Its first bullet gives a product size of 12 by 21 by 15.2 inches and a cabinet installation size of 13.5 by 22 by 19 inches. Its three dimension fields carry the first set exactly, and its size row repeats it a third time with each axis labeled.

That is the whole job done. A buyer who reads the fields gets the shelf, a buyer who reads the bullet gets the hole it needs, and nothing has to be guessed. VEVOR is also the only one of the five that publishes a weight, 13.23 lb, and it does not adjust, which is why none of its figures is one end of anything. Chrome plated steel, a 60 lbs load, and four steps to assemble.

A Row That Names Every Axis

KOSIWU writes its size row as a depth of 9.45 inches, a width of 32 inches and a height of 16.5 inches, with each axis spelled out in words beside its figure. The three dimension fields carry those same three numbers. On a page where two makers put a single adjective in that slot, a labeled triple is worth more than its precision suggests.

The catch is that KOSIWU is described as expandable and adjustable in height, and publishes no range for either. So the 32 inches is presumably one end of an expansion nobody states, and the 16.5 inches one position out of several. Its five bullets contain no measurement at all, so the row and the fields are the only figures on the listing and there is nothing to check them against.

Where a Field Is One End of a Range

The Row Shows Its Working

GeeBom is the one listing here that writes the range into the size row itself: a width of 11.8 inches, a depth of 15.9 inches and a height of 13.8 to 16.9 inches. Its first bullet repeats all four figures and prefaces them with the word approximately, which is more honesty than most listings offer about a measurement.

The height field then reads 16.9 inches, the top of that range. That is a defensible choice and it is also a trap for anyone measuring a cabinet, because the shelf will sit at 13.8 inches just as readily and the field never says so. Read the row rather than the field and the problem disappears. GeeBom publishes no weight, no load and no washing route, and arrives as a two pack.

Three Slots, Three Different Conventions

GEMWON puts the word Large in its size row and then publishes more figures in one bullet than any other listing here. It gives a fixed width of 11.2 inches, restated as 28.5 centimeters, an expandable length of 16.5 to 30.7 inches, an adjustable height of 13.19 to 16.73 inches, and both a maximum and a minimum overall size.

Now set its fields against that. The width field reads 16.54 inches, which is the bottom of the length range. The depth field reads 11.22 inches, which is the fixed width. The height field reads 16.73 inches, which is the top of the height range. Three slots, three different conventions, and the one labeled width holds a length. Its title advertises a maximum height of 16.7 inches instead.

Where No Field Describes the Shelf

A Base, a Ceiling and a Cabinet

Aisslro puts the word Small in its size row and publishes no measurement of the assembled shelf anywhere in its own sentences. Its first bullet gives three figures: cabinets with an interior length of 12 to 19.6 inches, an adjustment from 11.3 to 15 inches high, and a base it publishes at 3.07 inches. All three describe something other than the overall unit.

Its depth field reads 3.07 inches, which is the base the maker just named. Its height field reads 16.73 inches, which sits above the 15 inch ceiling the same bullet states. Its width field reads 19.68 inches, and the only figure anywhere near it on the listing is the 19.6 inch cabinet interior. Not one of the three fields is a published measurement of this shelf.

The Figure Two Brands Share

That 16.73 inch height field is not a one off. GEMWON publishes the same figure in the same slot, and on GEMWON it is correct: its own bullet ends its height range at 16.73 inches. On Aisslro the same number sits above the maker’s stated maximum of 15 inches. One figure, two listings, correct on one and unsupported on the other.

The practical rule follows from that. A field figure is worth something when a sentence on the same listing repeats it, and worth nothing when no sentence does. VEVOR, GeeBom and GEMWON all repeat their figures in words. KOSIWU publishes none in words but labels them in the row. Aisslro publishes three figures in words and none of them is what its fields contain.

Which One Fits Your Kitchen

The buyer who wants the cabinet figure given to them. VEVOR is the pick. It publishes a product size of 12 by 21 by 15.2 inches and a cabinet installation size of 13.5 by 22 by 19 inches, both labeled in the same bullet. It holds 60 lbs, weighs 13.23 lb, assembles in four steps, and installs on either the left or the right side.

The buyer whose cabinet height is the tight dimension. GeeBom writes its adjustment into the size row, 13.8 to 16.9 inches, so you know both ends before you buy. Its width and depth are 11.8 and 15.9 inches. It comes as a two pack with a silicone mat and an L shaped frame built to pass a drain pipe.

The buyer with a wide cabinet and a plumbing obstruction. GEMWON expands from 16.5 to 30.7 inches, keeps a fixed width of 11.2 inches, adjusts from 13.19 to 16.73 inches high, and publishes removable side panels for bypassing a U bend. It counts out eight ABS panels, four rails, twelve screws and two wrenches, holds 50 lbs per tier, and asks for hand washing only.

The buyer who wants a shallow footprint and nothing else explained. KOSIWU publishes a depth of 9.45 inches against 15.9 inches for GeeBom and 21 inches for VEVOR, with a width of 32 inches and a height of 16.5 inches, each axis labeled in the row. No range, no load figure, no weight and no measurement in any bullet, so what you see in the row is all there is.

The buyer who will measure the cabinet themselves. Aisslro is honest about asking for that. Use its own sentences, not its fields: an interior cabinet length of 12 to 19.6 inches, an adjustment from 11.3 to 15 inches high, a 3.07 inch base, a 52 lbs load and three fixing options including adhesive strips. Ignore all three dimension fields.

What We Could Not Verify

Six questions went looking for a figure on these listings and came back without one.

  • What the Aisslro shelf measures overall, where the maker publishes a base, a cabinet interior and an adjustment range and no size for the assembled unit.
  • Why the Aisslro height field reads 16.73 inches when its own bullet caps the adjustment at 15 inches.
  • How far the KOSIWU shelf expands, since the listing calls it expandable and adjustable in height and publishes no range for either.
  • Whether the GEMWON width field of 16.54 inches is the length fully retracted, since the maker’s own figure for that is 16.5 inches.
  • A weight for GeeBom, KOSIWU, GEMWON or Aisslro, none of which publishes one in a field or in any sentence.
  • A washing instruction for VEVOR, GeeBom, KOSIWU or Aisslro, three of which call a surface easy to clean without saying what to clean it with.