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 Project Supply's Never Rot 8 Inch Composite Shims, 24 Pack, Extreme Weight Capacity, Weatherproof, Easy To Break, Perfect For Doors, Windows And Sanding

Pro Project Supply's Never Rot 8 Inch Composite Shims, 24 Pack, Extreme Weight Capacity, Weatherproof, Easy To Break, Perfect For Doors, Windows And Sanding

Product ID: 194923902

Details

Brand
PHYXOLOGY
Colour
Black
Item diameter
8 Inches
Material
Wood
Shape
Flat

💪30% more load support

✂️4x easier clean breaks

🌧️Weatherproof & rot-resistant

NZ$149

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Level up your projects with shims that never quit!

ALL WEATHER RELIABILITY - Waterproof and decay-resistant design ensures no warping, cracking, or rotting—indoors or out.
VERSATILE MULTI PROJECT USE - Perfect for leveling doors, windows, cabinets, decks, and more—your go-to for every fix.
EFFORTLESS PRECISION SNAPPING - Pre-scored lines make breaking shims 4x easier—no tools, no mess, just snap and go.
LIFETIME SATISFACTION GUARANTEE - Backed by a no-nonsense money-back promise for worry-free, long-lasting performance.
UNMATCHED STRENGTH DURABILITY - Composite shims deliver 30% higher load capacity than wood for heavy-duty projects.

Pro Project Supply's Never Rot 8 Inch Composite Shims are premium, eco-friendly plastic wedges engineered for superior strength and weather resistance. With 30% more load capacity than wood, waterproof durability, and easy snap-to-size functionality, these 24-pack shims are ideal for precise leveling and repairs on doors, windows, furniture, and outdoor structures. Trusted by professionals and DIYers alike, they come with a lifetime satisfaction guarantee for dependable, rot-free performance.

Specifications

ASIN	B071FRHGXX
Best Sellers Rank	185,325 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 68 in Shim Stock
Brand Name	PHYXOLOGY SUPPLY
Colour	Black
Customer Reviews	4.6 4.6 out of 5 stars (2,073)
Grade Rating	Commercial
Item Diameter	8 Inches
Item Form	Sheet
Item Shape	Flat
Item Thickness	0.26 Inches
Manufacturer	Pro Project Supply
Material	Wood
Number of Items	24
Part Number	Never Rot Composite Shim
Specification Met	True
UPC	817244023647
Unit Count	24.0 count

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NZ$149

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

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TrustScore 4.5 | 7,300+ reviews

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