Size: 6mmPackage Includes:4pcs x Fish Tank Cover BracketsColor: Silver.Quantity: 4pcs/setMaterial: Stainless steel.designed for use with aquarium glass cover only; do not use these holders for non-intended use. Protect the aquarium cover from damaging while using.Features- Efficaciously prevent the fish from leaping out of the tank or pets to escape.- The premium aquarium clip is made of quality stainless, very durable and convenient.- Install in a second, very easy to use for more convenience if you want to keep fishes.- Help firmly hold the glass cover of the fish tank, assure slipping.- Compact and easy to fasten, providing a safe and protective living environment for your pet.