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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🛠️ Level up your projects with shims that never quit!

UNMATCHED STRENGTH - Supports up to 7,257 kg (16,000 lbs) for heavy-duty leveling tasks.
EFFORTLESS CUSTOM FIT - No cutting needed—fold to any size and save time on every project.
VERSATILE APPLICATION - Perfect for doors, windows, sheds, decks, and more—your go-to leveling solution.
ALL WEATHER DURABILITY - Built to resist corrosion, swelling, warping, and insect damage outdoors.
LIGHTWEIGHT PORTABLE - At just 520g per pack, easy to carry and store without bulk.

Project Supplys Never-rot 8 Inch Composite Shims come in a 24-pack designed for professional-grade leveling with extreme weight capacity (up to 7,257 kg). These weatherproof, insect-proof shims fold easily to any size without cutting, making them perfect for doors, windows, sheds, and more. Durable and lightweight, they ensure long-lasting performance in any outdoor environment.

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Number of Items	1
Manufacturer	Pro Project Supply
Part number	Never Rot Composite Shim
Item Weight	520 g
Package Dimensions	22.1 x 17.3 x 3.9 cm; 520 g
Is Discontinued By Manufacturer	No
Size	24個入り
Style	Outdoor
Finish	Unfinished
Number Of Pieces	24
maximum weight capacity	7257 Kilograms
Mounting Type	Door Mount
Batteries Included	No
Batteries Required?	No

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

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