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プロジェクトSupplys never-rot 8 Inch Composite Shims、24パック。ホーム改善DIYレベラーHave Extreme重量容量、は、耐候性、簡単にBreak & Perfect forドア、Windows、& Sheds。

ProプロジェクトSupplys never-rot 8 Inch Composite Shims、24パック。ホーム改善DIYレベラーHave Extreme重量容量、は、耐候性、簡単にBreak & Perfect forドア、Windows、& Sheds。

Product ID: 725673835

Details

UPC
817244023647
ブランド
PHYXOLOGY
形状
長方形
材質
プラスチック
色
ブラック

💪Supports up to 7,257 kg (16,000 lbs)

📏8-inch length for versatile use

🌧️100% weather & rot resistant

A$97

Duties & taxes included

In stock

Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Level Up Your Projects with Pro-Grade Precision!

CLEAN USER FRIENDLY - No splinters or residue; easy to drill and trim for a professional finish every time.
VERSATILE APPLICATION - Ideal for doors, windows, decks, sheds, plumbing, and more—your go-to leveling solution.
ALL WEATHER DURABILITY - 100% resistant to rot, warping, and insect damage—built to last indoors and out.
UNMATCHED LOAD CAPACITY - Handles extreme pressure up to 7,257 kg, perfect for heavy-duty leveling tasks.
PRECISION SNAPPING SIZING - Line-marked for effortless folding—no cutting needed, saving you time and hassle.

Pro Project Supply’s Never-Rot 8 Inch Composite Shims come in a 24-pack, engineered for professional-grade durability and precision. These black composite shims support up to 7,257 kg, resist weather and rot, and feature line markings for easy snapping without cutting. Perfect for leveling doors, windows, decks, and more, they offer a clean, reliable, and long-lasting solution for both indoor and outdoor projects.

Specifications

ASIN	B071FRHGXX
Amazon 売れ筋ランキング	産業・研究開発用品 - 497,587位 ( 産業・研究開発用品の売れ筋ランキングを見る ) シム - 494位
UPC	817244023647
おすすめ度	4.6 5つ星のうち4.6 (2,081) var
カラー	ブラック
パッケージ内に含まれる商品の数	1
ブランド名	PHYXOLOGY SUPPLY
メーカー名	Pro Project Supply
メーカー型番	Never Rot Composite Shim
商品の形状	長方形
等級	業務用。
素材	プラスチック

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