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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Project Supplys Never-rot 8 Inch Composite Shims, 24 Pack Home Improvement DIY Leveler Have Extreme Weight Capacity, Weather Resistant, Easy Break & Perfect for Doors, Windows, & Sheds

Project Supplys Never-rot 8 Inch Composite Shims, 24 Pack Home Improvement DIY Leveler Have Extreme Weight Capacity, Weather Resistant, Easy Break & Perfect for Doors, Windows, & Sheds

Product ID: 725673835

Details

Brand
PHYXOLOGY
Color
Black
Material
plastic
Shape
Rectangular
UPC
817244023647

✂️No cutting needed, fold-to-fit

🌧️100% weather & insect proof

🛠️7257 Kg load capacity

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RM382

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Level up your projects with shims that never quit!

TRUSTED QUALITY - Top-rated with 4.6 stars and Amazon bestseller status.
UNMATCHED STRENGTH - Supports up to 16,000 lbs—built for the heaviest projects.
EFFORTLESS CUSTOM FIT - Fold to any size—no cutting or tools required.
VERSATILE APPLICATION - Ideal for doors, windows, sheds, decks, and more.
WEATHERPROOF DURABILITY - Never rot, warp, or swell—perfect for any climate.

Project Supplys Never-rot 8 Inch Composite Shims come in a 24-pack designed for professional-grade leveling and support. Each shim withstands an extreme weight capacity of 7257 Kg (16,000 lbs) and is 100% weatherproof and insect resistant, ensuring long-lasting performance outdoors without warping or corrosion. Their foldable design eliminates the need for cutting, saving time and effort on any home improvement or construction task.

Specifications

ASIN	B071FRHGXX
Amazon Bestseller	#331,068 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #334 in Shims & Shim Stock Raw Materials
Brand Name	PHYXOLOGY SUPPLY
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (2,050)
Grade Rating	業務用。
Item Shape	Rectangular
Manufacturer	Pro Project Supply
Material	plastic
Number of Items	1
Part Number	Never Rot Composite Shim
UPC	817244023647

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