Top 10 Best window shims in 2026

Last Updated - 6/7/2026

🏆Best Choice

Nelson Wood Shims

Nelson Wood Shims 8" 24 Pack - Kiln Dried Wood

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Nelson Wood Shims Store

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$7.20

$8.44

-15%

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Stock Your Home

Composite Shims (36 Pack) - Hard Composite Shims for Home Improvement - Never Rot Shims for Leveling - Restaurant Table Shims - Table Wedges - Toilet Shims - DIY Furniture Levelers - Stock Your Home

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Proudly Made in the USA: Made of 100% recycled materials, our composite shims are great for leveling in both indoor and outdoor applications. Our stackable shims are a heavy duty solution to wooden wedges that won’t rot, warp, or crack. With 37 pre-scored lines, our composite shims are 4x easier to snap than wood. They also support more weight, allowing you to level heavy appliances, furniture, and more!
•Never Rot Shims: Unlike wooden shims, our composite shims are rot-proof, and resistant to decay. Our never rot shims for leveling are also weather-proof, easily holding up to rain, snow, and other harsh conditions. In fact, our composite wedges won’t split or crack due to pressure. Our shims are able to support 30% heavier loads than wood. You can be sure that our shims will last you a lifetime.
•No Additional Cutting: Save time and energy with our pre-scored shims. Designed with 37 notches, there is no need for additional cutting or trimming with our furniture levelers. All you have to do is measure, and snap our shims to the size you need - no tools required!
•Multipurpose Wedges: Whether you’re a professional or are working on some home improvement projects, our shims will help you get the job done right. Use our heavy duty composite shims for plumbing, appliances, cabinets, countertops, doors, windows, sheds, decks, and mailbox posts. Utilize them as table wedges for restaurants, DIY levelers for furniture, and more!
•Great Value Pack: Our value pack comes with 36 pre-scored composite shims. Shims measure approximately 7.75” Length, 1.5” Width, and 0.25” height. Taper measures 5/16” to 1/16”.

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$15.99

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ZZJMCH

ZZJMCH 12 Pack White Multi Purpose Furniture Plastic Shims for Leveling Extreme Weight Capacity Wedges Easy to Snap Cut-to-fit Size Leveler for Toilet Shims, Doors, Windows, Sheds, Table

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Multi Purpose Furniture Plastic Shims Adjustable size: 3.86 x 0.8 inch/ 10 x 2 cm, White, (12 Pcs) .
•Furniture Plastic Shims Use to stabilize and level various objects. Great for leveling bookcases, Toilet, tables, doors, windows, plumbing fixtures, cabinets, playhouses, sheds, deck & mailbox posts a breeze.
•Plastic Shims so you can break it at will and place it where you want to put it according to actual needs to reduce the exposed part and keep your home beautiful.
•Multi Purpose Furniture Plastic Shims can be Stackabled one by one, if you your interspace is too big you can use two or three to stackable together.
•Multi Purpose Furniture Plastic Shims Tasteless and safe: this shed leveling kit is made of plastic material, safe, reliable, tasteless, can be applied with confidence; Textured design helps stabilize and level various objects, making life faster and easier.

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$5.55

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Nelson Wood Shims

Nelson Wood Shims - 8-Inch Wood Shims for Leveling, Pro Pack, 120 Count Wedges for Toilets, Tables, Doors & Furniture Levelers for Uneven Floors

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•VERSATILE: Ideal for leveling, labeling, and repairing appliances, doors, toilets, tables, cabinets, joists, floors, stairs, and more.
•TRUSTED QUALITY: The most recognizable wooden shim among DIY enthusiasts and home developers, known for high-quality performance at a value price.
•100% KILN DRIED: Ensures no shrinking or splitting, providing long-lasting durability and reliability.
•HIGH PERFORMANCE: 8-inch shims with thin feathered tips offer flexibility and ease of use, ensuring clean and consistent quality.
•PRECISION ALIGNMENT: Thin feathered tips allow for precise adjustments, making them perfect for seamless and professional trim installations.

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$21.79

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Broadfix

Broadfix Shim Flat Plastic 60PK

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Broadfix 1.13 in. W X 4 in. L Plastic Shim 60 pk
•These shims are widely used in the glazing and wall covering industries due to their high compressive strength and easy stacking.
•For use indoors and outdoors will never warp or swell.
•Packaging may vary.
•Pack of 1.

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$7.24

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Glazelock

Glazelock Plastic Horseshoe Shims for Leveling Multipack (100-Piece 1/4, 1/8, 1/16, 1/32-inch) U Shape Tile Shims Spacers to Level Windows, Floors, Toilets, Doors – Indoor Outdoor Use - Made in USA

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•HORSESHOE SHIM MULTIPACK: These high impact plastic two-inch long shims are used for installing and leveling commercial and residential windows, doors, cabinets, countertops and plumbing. Also, these reusable shims work great as tile shims and can be moved around quickly. Width options included: 1/4-inch, 1/8-inch, 1/16-inch and 1/32 inch
•U-SHAPE DESIGN: These hard plastic shims and wedges for leveling are designed with a unique U-Shape which allows the shims to fit around existing bolts and window anchors, providing users an easier shim application process. The different width options can easily be inserted into a gap when aligning door frames, windows and working with drywall.
•OUTDOOR & INDOOR USE: Glazelock heavy-duty plastic toilet shims for leveling won’t rot, crack, warp, swell or split in wet, hot or cold environments. Their durable performance is trusted by professional contractors to level align joists, doors, counters, cabinets, sheetrock, furniture levelers and much more!
•PLASTIC SHIM PACK OPTIONS: These high impact polystyrene (HIPS) horseshoe plastic shim spacers are available in multiple quantity options; 100 shims (25 per size), 200 shims (50 per size) or 400 plastic shims (100 per size). Please select your quantity option for your next home improvement project.
•MADE IN USA: Based in Kankakee, IL, USA, Glazelock designs and manufactures wood and high impact composite plastic shims for both professional installers and the do-it-yourselfer’s!

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$17.99

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CRL

CRL 1/16" x 3-1/2" Shimstack Shims - Case of 1000

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Adjustable in Thickness and Length with Just a Snap
•Individual Shims Snap Off for the Perfect Thickness and Length Every Time
•Installation Tab Makes Insertion Easy

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$56.25

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ZUXUSE

ZUXUSE 600Pcs Horseshoe Shims, Plastic Shims, Tile Shims, Window Shims, U Shims, Plastic Shims for Leveling, Blue 1/16”, Red 1/8”, Yellow 3/16”, Black 1/4”

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•【Size】Thickness of the horseshoe shims: 1/16” , 1/8” , 3/16” , 1/4” . Length & Width of u spacers: 2 x 1.3 inch
•【Color Identification】Different colors of glazing shims indicate different thicknesses: blue 1/16”, red 1/8”, yellow 3/16”, black 1/4”, which is convenient for you to distinguish and use
•【Durable Material】The window shims are made of polypropylene(PP) that is reliable and stable. You could use it multiple times
•【Application】The horseshoe spacers are great for horizontal and vertical tile installation, also suitable for window installation, aligning granite, marble and so on. It is very suitable for people who are engaged in the construction industry
•【Easy to Use】 You just need to put the prongs of the tile spacers in grout joint to align and space, and there will be a appropriate spacing

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$32.99

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Glazelock

Glazelock Plastic Peel Away Stackable Shims for Leveling 32 Pieces (3-1/2” Length – 1/16” Thickness) U Shape 5/8” Bolt Hole Tile Spacers to Level Windows, Doors, Floors, Toilet Shims – Made in USA

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•SNAP OFF SHIM STACKS: These high impact plastic stackable shims are used for installing and leveling commercial and residential windows, doors, cabinets, countertops and plumbing. Also, these reusable shims work great for tile spacers and can be moved around quickly. 16 Shims per stack, with individual thickness of 1/16”, and snap off length of 3-1/2-inch.
•U-SHAPE DESIGN: These hard plastic shims and wedges for leveling are designed with a unique U-Shape 5/8” bolt hole which allows the shims to fit around existing bolts and window anchors, providing users an easier shim application process. The different width options can easily be inserted into a gap when aligning door frames, windows and working with drywall.
•OUTDOOR & INDOOR USE: Glazelock heavy-duty plastic toilet shims for leveling won’t rot, crack, warp, swell or split in wet, hot or cold environments. Their durable performance is trusted by professional contractors to level align joists, doors, counters, cabinets, sheetrock, furniture levelers and much more!
•PEEL AWAY SHIMS: These high impact polystyrene (HIPS) stackable shim spacers are available in different quantity options. 3-1/2” length: 32 shims (2 stacks total) or 960 shims (60 stacks total). Also available is our 3-3/16" length shims, 2,000 shims (250 stacks total). Please select your quantity option for your next home improvement project.
•MADE IN USA: Based in Kankakee, IL, USA, Glazelock designs and manufactures wood and high impact composite plastic shims for both professional installers and the do-it-yourselfer’s!

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$9.99

$11.99

-17%

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Nelson Wood Shims

Nelson Wood Shims - DIY Bundle Wood Shims 8-Inch Shims, High Performance Natural Wood, 100% Kiln Dried - 1 Pack (12 Shims Total)

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•MANY USES: Our wood wedge shims can be used for leveling, labeling, repairing the following: appliances, doors, toilets, tables, cabinets, joists, floors, stairs, and more.
•TRUSTED and RELIABLE: Most recognizable wooden shim on the market among DIY'ers today, Top pick for both many homowners and home developers, high quality shims for a value price.
•100% KILN DRIED: No molding or rotting. No shrinking either.
•HIGH PERFORMANCE: Our 8" shims have thin feathered tips that make them flexible and easy to use. Our shims have a clean, consistent, dependable quality.
•THIN FEATHERED TIPS for ALIGNMENT: Enable precise adjustments, ensuring seamless, professional trim installations.
•NATURAL WOOD: There are no chemicals, additives, fumigation, or treatment. Our shims are proudly made in USA, making the wood used in the shims naturally sourced.

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$5.48

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