How thick is the fat end?

It is approximately 0.29 inches thick at its thickest point.

will these crack if nailed down?

I haven't tried to nail them, but I would expect them to break if you did. They are a light composite material that feels quite brittle. If you really need to fix them in place I would suggest drilling a hole in them and then nailing or screwing them down through the hole.

They are 1.5" wide Thanks for reaching out! Thank you. John Customer Concierge

Could these level a 20 gallon aquarium ?

If you are asking whether it will handle the weight of 20 gallons of water in addition to the weight of the tank and its stand, I don't see why not. I am using these to lean back to the wall two 4' solid wood bookcases placed on top of each other with mending plates (so 8' tall bookcase) filled with approximately 3000 dvds. However, I would probably at least lower the water level in your aquarium since if you can't empty it first since the water is likely to slosh around a bit. I would more be worried about whether the stand your aquarium sits on has the right leg design to withstand the shock of using these shims to level a 20 gallon aquarium if you plan on doing it while there is water in the aquarium.

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Pro-Grade Composite Shims for Heavy Duty Leveling. 24 pk 7.75 Inch, Never Rot, Easy Snap, Level Wedges. Water, Weather Resistant for Toilets, Doors, Windows, Sheds. Support Appliances and Furniture

Pro-Grade Composite Shims for Heavy Duty Leveling. 24 pk 7.75 Inch, Never Rot, Easy Snap, Level Wedges. Water, Weather Resistant for Toilets, Doors, Windows, Sheds. Support Appliances and Furniture

Product ID: 43908325

Details

Brand
PHYXOLOGY
Color
Black
Item Diameter
8 inches
Material
Plastic
Shape
Rectangular

💪16,000 lbs load capacity

✂️Pre-scored easy snap lines

🌧️Water & weather resistant

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Description

🔧 Level Up Your Projects with Pro-Grade Precision!

SNAP TO SIZE CONVENIENCE - Pre-scored lines let you customize shims quickly—no tools needed
WEATHERPROOF ROT PROOF - Built to withstand rain, snow, and insects without warping or decay
UNMATCHED HEAVY DUTY STRENGTH - Supports up to 16,000 lbs for the toughest leveling jobs
VERSATILE INDOOR OUTDOOR USE - Perfect for doors, windows, sheds, furniture, and more
LIFETIME SATISFACTION GUARANTEE - Confidence backed by a no-nonsense, money-back promise

These Pro-Grade Composite Shims are 7.75-inch, ultra-durable plastic wedges made from 100% recycled materials. Engineered to support up to 16,000 lbs, they resist rot, swelling, and weather damage, making them ideal for both indoor and outdoor heavy-duty leveling tasks. Featuring easy-to-break pre-scored lines, these shims snap cleanly without tools, ensuring fast, precise adjustments. With 24 shims per pack and a lifetime satisfaction guarantee, they’re the smart, sustainable choice for professionals and DIYers alike.

Specifications

ASIN	B071FRHGXX
Best Sellers Rank	#13,333 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Siding Building Material
Brand Name	PHYXOLOGY SUPPLY
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (2,206)
Grade Rating	Commercial
Item Diameter	8 inches
Item Form	Sheet
Item Shape	Rectangular
Item Thickness	0.26 inches
Manufacturer	Pro Project Supply
Material	Plastic
Number of Items	24
Part Number	Never Rot Composite Shim
UPC	817244023647
Unit Count	24 Count

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37618CFA

Duties & taxes included

In stock

Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cote D' Ivoire.

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