The best glazing blocks, compared.
Top pick: HXC 68-piece PVC shims Best value: Eleechen 72-piece glazing packers – About £5.99 for 72 pieces and 4.6 from 127 ratings of its own. The listing's size fields do not all agree. Updated October 2026.
Glazing blocks on amazon.co.uk are plastic glazing packers: small rigid shims for packing a window or door frame, or for supporting glass in the rebate. Shoppers also say window packers, flat packers and plastic shims. They also match children's construction toys and glass bricks, which are different products. You tell a useful pack by shape, footprint, a real thickness mix and a piece count that matches the job. Flat plates go in before the load sits on them. A horseshoe or U packer slides around a screw that is already started. Trade flats are often 100 mm long and 24–32 mm wide so both panes can sit on the packer, and everyday thicknesses are 1–6 mm. Installation packers should sit beside the fixings and resist compression, rot and corrosion. A bag of packers is not a FENSA certificate and not a test to BS 8213-4. Width and pack size are in the [glazing packer buying guide](/hub/diy-supplies/glazing-blocks/sub/glazing-blocks-buying-guide). Flat plates and U-slots are set out under [flat and horseshoe packers](/hub/diy-supplies/glazing-blocks/sub/glazing-blocks-flat-vs-horseshoe). General packing that is not a glazing rebate sits with [shims](/hub/diy-supplies/shims).
Glazing blocks on amazon.co.uk are plastic glazing packers: small rigid shims for packing a window or door frame, or for supporting glass in the rebate. Shoppers also say window packers, flat packers and plastic shims.
38 products checked · 64 hrs invested · +18,600 readers
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Personal buying guide
Question 1 of 2
What shape does the job need?
The HXC pack is 68 PVC flats, 17 each of 1.5 mm red, 3 mm blue, 5 mm yellow, and 10 mm green, at 60 × 40 mm, for £9.95. The colour map is printed, and it is not the 1–6 mm merchant map. Across five amazon.co.uk ratings it sits at 5.0, and three stored UK reviews say the pieces levelled machines, that there was a decent amount, and that it was a good product. None of those three describes a window. Five perfect ratings are not a stronger test than 4.6 from 1,122. There is no 1 mm or 2 mm piece, so a tight frame gap means stacking or a different bag. The bullets claim waterproof indoor and outdoor use, which remains a listing claim rather than a weathering test, so buy it for a 10 mm shim rather than for a full five stars.
Pros
Cons
Best for: A 60 × 40 mm levelling job that needs 10 mm pieces and a printed colour map.
Less suitable: A uPVC rebate that needs 1–6 mm glazing packers, or a buy based on five stars alone.
Specifications
Common questions
What colours match which thickness?
The bullets say 1.5 mm red, 3 mm blue, 5 mm yellow, and 10 mm green, 17 pieces of each, 60 × 40 mm.
What are they made of?
The bullets say polyvinyl chloride, and claim waterproof, indoor and outdoor use.
Do the reviews mention windows?
The three UK reviews mention levelling machines and a decent amount. They do not describe a window.
The Spesh pack is 40 ribbed pieces, ten each of 1.5 mm red, 3 mm blue, 5 mm yellow, and 10 mm green, at 60 × 40 mm, for £9.99. The listing calls the material tough plastic and does not name the polymer. Across eight amazon.co.uk ratings it sits at 4.8, and one UK review body says the selection can be doubled up and was more than adequate. A German review in the file is not UK opinion and is not used here. The Best Sellers Rank sits in Window-Dressing Hardware, which is a strange shelf for glazing shims. The dimensions field prints 6 × 4 × 0.3 cm, which matches one thickness rather than the whole mix. Eight ratings and one UK sentence are not enough to prefer this over the FUX 40-piece set if you need up to 20 mm, or over a £5.99 1–6 mm pack if you do not.
Pros
Cons
Best for: A small 60 × 40 mm shim set when you will stack pieces and you only need up to 10 mm.
Less suitable: A glazing rebate that needs 1–6 mm in 1 mm steps, or a job that needs more than ten of one thickness.
Specifications
Common questions
Can they be used outdoors?
The listing questions ask about outdoor projects and weather. The bullets claim scratch resistance and load capacity. A weathering test is not stated.
Can they level furniture?
A listing question asks this, and the bullets name furniture levelling. The UK review says they can be doubled up.
Do you need tools?
The bullets say no extra tools, and mention placing prongs in grout joints.
The EVOGES pack is 42 flat pieces, seven each of 1 mm through 6 mm, at 28 × 100 mm, for £6.99. Across 347 amazon.co.uk ratings it sits at 4.7, the second-largest count in this set, and 50 stored UK reviews were read. Those texts include resetting a double-glazed window, levelling a large shed base, and general jobs around the house. One window review needed build-up bars as well, because the window was the wrong size and the packers could not close that gap. Most of the 50 texts are one-line praise, so there is little on how the plastic holds up after a season. The polymer is not named, and the colour map is not printed. It is a workable 28 mm mixed pack for one door or one window if seven of each thickness is enough, and a thin stock bag if you fit windows every week.
Pros
Cons
Best for: One window or one door at 28 × 100 mm when you want a large rating count at £6.99.
Less suitable: A fitter who needs a tub of hundreds, or a gap over 6 mm.
Specifications
Common questions
How many of each thickness are in the pack?
The listing says 42 pieces, seven each of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm, at 28 × 100 mm.
Does the listing say they suit windows?
Yes. The title and bullets name window and door frame installation. UK reviews also mention a window and a shed base.
Is outdoor use stated?
The bullets say indoor and outdoor installations. That is a listing claim.
The HuangXinyu 72-piece set is twelve polypropylene flats of each thickness from 1 mm to 6 mm, at 100 × 28 mm, for £5.99. The listing says each piece has a slim groove and a size mark on the back. Across 74 amazon.co.uk ratings it sits at 4.7, and 15 stored UK reviews describe DIY packing, a door fit, and solid plastic tapped in for floors and pipe clips without snapping. One reviewer says a couple of pieces were not the same depth, and the colours are called unlike other manufacturers. The same review wording, the same star line, and the same Best Sellers Rank appear on the 60 × 40 mm HuangXinyu listing, so this 74 is not a second independent sample. Treat it as one pool shared with B0F4WYS9CP until a live page separates them. The size mark on the back is the useful part if you already know you want 100 × 28 mm.
Pros
Cons
Best for: A 100 × 28 mm mix at £5.99 when you will read the size on the back and you accept the shared review file.
Less suitable: Anyone counting this 74 and the other HuangXinyu 74 as 148 separate ratings.
Specifications
Common questions
What is in the box?
The listing says 72 pieces, 12 each of 1 mm to 6 mm, each 100 × 28 mm, polypropylene, with a groove and a size mark on the back.
Are the colours a standard code?
The listing does not print a colour map. A UK review says the colours do not match other manufacturers.
Can they be stacked?
A listing question asks if they are easy to stack. The bullets say they are easy to place and stack. A review describes tapping them in.
The HuangXinyu 80-piece set is twenty polypropylene flats each of 1.5 mm, 3 mm, 5 mm, and 10 mm, at 60 × 40 mm, for £8.99. The title, part number 16-YSL-W-67, and footprint differ from the 72-piece HuangXinyu set. The stored star line is still 4.7 from 74, the Best Sellers Rank is the same 4,417 in DIY & Tools, and the 15 UK review bodies match that other file, including the uneven-depth comment. Do not read this as a second group of 74 people who tried the 60 × 40 mm pieces. The bullets do name laminates and window installation, and a listing question asks about laminate. Until the live page shows its own reviews, the useful fact is the thickness set: it reaches 10 mm, which the 1–6 mm bags do not, in a wider shim rather than a 100 mm glazing packer.
Pros
Cons
Best for: A 60 × 40 mm shim job that needs 10 mm pieces, if you ignore the shared 74-rating line.
Less suitable: Anyone using the 4.7 from 74 as proof that this footprint was reviewed on its own.
Specifications
Common questions
What thicknesses are included?
The listing says 80 pieces: 20 each of 1.5 mm, 3 mm, 5 mm, and 10 mm, at 60 × 40 mm.
Is this the same product as the 72-piece HuangXinyu set?
The title, part number, and footprint differ (60 × 40 mm, up to 10 mm). The stored star line, rank, and review text match the 72-piece file.
Can they be used on laminate?
A listing question asks about laminate, and the bullets name laminates. That is a listing claim.
The Yonfas title says 90 flat pieces, 1–6 mm, 28 × 100 mm, for window and door installations, at £6.69. The product-dimensions field says 1 × 2 × 3 cm, which cannot describe the same packer, and the stored listing does not say how many of each thickness are in the 90. The bullets claim a toothed face and a colour code, while the colour field says no and no map is printed. The polymer is not named. The star line is 4.7 from four ratings, and the stored listing has no UK review bodies. Four ratings with no text is not a sample you can read for windows, sheds, or defects. At this price the Eleechen and HuangXinyu 72-piece sets state a 1–6 mm mix and have review text, which this file does not. Check the live page before you trust the 28 × 100 mm title over the 1 × 2 × 3 cm field.
Pros
Cons
Best for: Only after you open the live listing and confirm the 28 × 100 mm size.
Less suitable: A first window, where you need size fields that agree and reviews you can read.
Specifications
Common questions
How many pieces, and what size?
The title says 90 pieces, 1–6 mm, 28 × 100 mm. Product dimensions are printed as 1 × 2 × 3 cm. Both are kept because they conflict.
Is there any UK review text?
The star line says 4.7 from 4 ratings. The stored listing has no UK review bodies.
What plastic is it?
The bullets say durable plastic and a toothed face. The polymer name is not stated.
The FUX 100-piece set is a mixed bag of flat recycled-polypropylene packers, 100 × 24 mm, from 1 mm to 6 mm, at £11.99. Across 1,122 amazon.co.uk ratings it sits at 4.6, and 25 stored United Kingdom reviews describe decking joists, a log-cabin build, and packing jobs that reviewers compared with Screwfix. The listing claims a groove as a ventilation channel. That is a seller line, not a bridge packer for a named uPVC profile. One of those reviews says the plastic is very brittle if you cut it, and another reports mould flash on the 1 mm pieces and some sizes that are not flat. Those notes come from single reviewers, not a repeated defect in the 25 texts. At 24 mm wide it can sit short of both panes on a wider sealed unit. It is the top pick in this set because it has the deepest rating history at 4.6, if you measure the rebate before you treat 24 mm as the right width.
Pros
Cons
Best for: A mixed 1–6 mm flat pack when you want the largest UK rating sample and the rebate accepts 100 × 24 mm.
Less suitable: Triple glazing that needs a wider packer, or a job where you have to cut the pieces.
Specifications
Common questions
What size are these FUX packers?
The listing says 100 pieces, 100 × 24 mm, mixed from 1 mm to 6 mm, in recycled polypropylene.
Does the listing say they can be used outdoors?
The bullets say the material is weather and light resistant. That is a listing claim, not a weathering test.
Are tools required?
The stored listing does not say the set is tool-free. One UK review says the plastic is brittle if you cut it.
The Eleechen pack is 72 polypropylene pieces, listed as 28 × 100 mm and mixed from 1 mm to 6 mm, at £5.99. Across 127 amazon.co.uk ratings it sits at 4.6, and 31 stored UK reviews call it handy and as described. Those texts include bringing tiling back plumb, spacing log-cabin roof and floor panels at 2 mm and 5 mm, and minor adjustments while fitting a kitchen. One reviewer who found the plastic durable also found the colours hard to remember. The listing does not print a colour map, the item-thickness field says 6 mm while the title says mixed 1–6 mm, and a diameter field of 28 mm sits beside rectangular dimensions of 10 × 2.7 × 0.1 cm. Measure a piece before you trust the colour. It is the best value in this set on price and its own 127 ratings, if you can live with those clashing size fields.
Pros
Cons
Best for: A cheap 1–6 mm mixed pack for one house job when you will measure the pieces.
Less suitable: Anyone who needs a printed colour map, or a gap above 6 mm.
Specifications
Common questions
What is the footprint?
The title says 28 × 100 mm and the highlight says mixed 1–6 mm, 72 pieces. Item dimensions are printed as 10 × 2.7 × 0.1 cm, and a diameter field says 28 mm.
Do you need tools?
The bullets say you place them with no additional tools. That is a listing claim.
Can they be used on a floor?
The bullets name floor alignment and tile spacing. A UK review describes tiling and another describes a kitchen.
The FUX 40-piece set is five flat recycled-polypropylene shims of each thickness from 1.5 mm to 20 mm, each 60 × 40 mm, at £16.49. It is the only pack in this set whose bullets go to 20 mm. Across 431 amazon.co.uk ratings it sits at 4.5, and 11 stored UK reviews mention a window and frame alignment, solar-panel brackets, a shed base, timber lifted off paving, and kitchen drawer fronts. One of those reviews says the plastic did not crack when tapped in and did not compress under that load. That is one reviewer’s observation, not a figure in newtons. Another calls the bag a little pricey for the amount of plastic, and one wanted a 44 mm width for triple glazing. A further review says the pack was not suitable for the job and does not say which job. Use it when the gap needs a thick shim, and leave it when a 1–6 mm glazing footprint is all the opening needs.
Pros
Cons
Best for: Shed bases, brackets, and gaps that need 8–20 mm, when a 1–6 mm bag will not reach.
Less suitable: Everyday 100 mm glazing packers, or a one-window job that only needs 1–6 mm.
Specifications
Common questions
How thick do these go?
The listing says 1.5 mm to 20 mm, five pieces of each size, 40 pieces in total, each 60 × 40 mm.
Can they be used outdoors?
The bullets say weather and light resistant. UK reviews describe shed bases, paving, and solar brackets.
Are they the same as the FUX 100-piece set?
No. This set is 40 pieces at 60 × 40 mm up to 20 mm. The other FUX set is 100 pieces at 100 × 24 mm from 1 mm to 6 mm.
The Vurixfo set is 138 polyethylene flats, 23 of each colour from 1 mm to 6 mm, at 100 × 28 mm, for £10.99. The bullets print a colour map: 1 mm grey, 2 mm green, 3 mm white, 4 mm red, 5 mm blue, and 6 mm black. That is not the green-to-red map some UK merchants publish. Across five amazon.co.uk ratings it sits at 4.4, and only two UK review bodies are in the stored listing. Both praise colour coding for doors, windows, and small DIY jobs, and both say the plastic stays put and does not bend easily. Neither reports a defect. Five ratings is too small to treat that praise as a test, and the Best Sellers Rank sits in Hardware Spackling Paste, which is an odd shelf for packers. The piece count is the largest here, at about 8 pence each on the stored price, if you accept a thin rating line.
Pros
Cons
Best for: A large 1–6 mm stock of 100 × 28 mm pieces when a printed colour map matters more than review depth.
Less suitable: Anyone treating five ratings as a stronger test than the FUX or EVOGES counts.
Specifications
Common questions
Which colour is which thickness?
The bullets say 1 mm grey, 2 mm green, 3 mm white, 4 mm red, 5 mm blue, and 6 mm black, 23 pieces of each.
Do you need tools?
The bullets say you place them in the gap with no extra tools.
What are they made of?
Technical details say PE. The bullets say polyethylene and claim water resistance.
This is the only U-shaped pack in this set: 80 PVC pieces at £12.99, with product dimensions printed as 6 × 4 × 0.1 cm. The bullets say you can slide the slot around a fixing without pre-drilling. The title says 1.5/3/5/10 mm. The bullets list 20 × 1 mm red, 20 × 1.5 mm blue, 10 × 3.2 mm green, 10 × 5 mm, 10 × 6.4 mm, and 10 × 10 mm. Those two thickness lists cannot both be the whole story, and the stored listing keeps both. There is no Customer Reviews line, so the rating is not known, and no UK review body was read. The included-components field says a scraper, which is an odd line on a packer listing. A horseshoe shape is what you want when a frame screw is already started, though it is not a bridge packer for a drained rebate and it is not a scored pick while the thickness list and the star line are both unresolved.
Pros
Cons
Best for: Packing around frame screws that are already started, after you check the live thickness list.
Less suitable: Supporting glass on a drained rebate, or anyone who needs a rated flat 1–6 mm pack.
Specifications
Common questions
Are these flat or horseshoe packers?
The bullets say a U-shape that can be used without pre-drilling. That is the horseshoe style, not a solid flat plate.
Which thicknesses are in the pack?
The title says 1.5/3/5/10 mm. The bullets list 1 mm, 1.5 mm, 3.2 mm, 5 mm, 6.4 mm, and 10 mm. Both wordings are in the stored listing.
Is there a star rating?
This set has no Customer Reviews line, so the rating is not stated.
Shelf prices, stars and review notes are the amazon.co.uk snapshot of 21 October 2026 already stored for these eleven listings. This is not a compression test, a weathering test, or a FENSA check. Each score adds amazon stars, the review sample, whether the listing's size fields agree, and United Kingdom review comments. Price is used only to choose best value, not to raise the score. The highest score is the top pick. The two HuangXinyu listings share one pool of 74 ratings, so those counts are not added together.
Amazon stars
42%Stars are multiplied by 8 and rounded. A 4.6 becomes 37. A listing with no star line scores 0. The star line is the amazon.co.uk figure, not a lab mark.
Review sample
25%Larger amazon.co.uk samples score higher: 24 at 1,000 reviews or more, 18 from 100 to 999, and less below that. The two HuangXinyu files share one pool of 74, so each sample mark is cut.
Listing clarity
21%Footprint, thickness mix and piece count should agree inside the listing. A dimensions field that contradicts the title, a missing count per thickness, or a colour map that is claimed but not printed lowers this mark.
UK review signal
12%Stored United Kingdom review text adds a mark when it describes a window, a door, a shed or a fault. Text from outside the UK is not used. A shared review pool is not counted twice.
Choose glazing blocks by shape, footprint, thickness mix and piece count. A colour you remember from another brand is not a thickness. A bag of packers is not a certificate for the installation.
Glazing blocks in a UK search are almost always plastic glazing packers. They are small rigid shims. You use them to pack a window or door frame in an opening, or to support glass in the rebate. Shoppers also say window packers, flat packers and plastic shims. The words also match children's construction toys and glass bricks. Those are different products, and a toy brick will not do this job. Shape comes first. Flat packers go in before the load sits on them.
A common merchant map runs from 1 mm green through 6 mm red. Other listings print a different map, or none. Read the thickness in millimetres on that piece.
A setting block should support both panes. A 24 mm piece under a wider unit can load one pane. Bridge packers exist so a sealed unit does not block drainage. A flat bag is not that shape.
Everyday glazing thicknesses are 1–6 mm. Do not assume that mix includes 10 mm or 20 mm pieces. Over-tightening fixings can crush the packers that should stay in place.
Shape decides when the packer can go in. Flat plates sit in the gap before the glass or the frame load is on them. Horseshoe or U packers slide around a screw that is already started, so you do not have to back the fixing out. Bridge packers are a third shape. They hold a sealed unit up so it does not cover the drainage in the rebate. If the listing is a flat bag, it is not a bridge packer, and you still have to keep the drain slots clear. Footprint is the next check, and it is a width check.
Everyday glazing thicknesses are 1–6 mm. Measure the gap before you buy a colour. A common merchant map runs from 1 mm green through 6 mm red. That map is not universal. Listings print other colours, or none at all, and a colour you remember from another maker can be the wrong thickness. Read the millimetre on the piece, or a map printed on that listing. Piece count follows the job. One door can use a small mixed bag.
Three typical situations, each with a recommendation from this comparison.
You are packing one opening and the rebate accepts a 100 × 24 mm flat. The FUX 100-piece set is the top pick at about £11.99, with 4.6 from 1,122 ratings and a 1–6 mm mix. Measure the width before you treat 24 mm as enough for both panes.
You need a shim past 6 mm, for a shed base, a bracket or a frame gap a 1–6 mm bag will not close. The FUX 40-piece set lists 1.5–20 mm at 60 × 40 mm, about £16.49, with 4.5 from 431 ratings.
You want a 1–6 mm mixed bag and you will measure the pieces. The Eleechen 72-piece set is best value at about £5.99, with 4.6 from 127 ratings of its own. The size fields on that listing do not all agree.
The top pick is the FUX 100-piece set at about £11.99. It scores 88, the highest in this set: flat polypropylene, 100 × 24 mm, mixed 1–6 mm, and 4.6 from 1,122 amazon.co.uk ratings. The 24 mm width can miss the second pane on a wider sealed unit. Best value is the Eleechen 72-piece set at about £5.99. It scores 74, with 4.6 from 127 ratings of its own, and the size fields on that listing do not all agree, so measure a piece. This is not a lab test.
Eleechen 72-piece glazing packers
About £5.99 for 72 pieces and 4.6 from 127 ratings of its own. The listing's size fields do not all agree.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources and the amazon.co.uk listings compared on this page. Listings captured 21 October 2026.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the amazon.co.uk figures already stored for this set. This is not a laboratory test.
