Material: Alloy Quantity: 4 pieces Inner diameter:1 1/4''(32 mm).Thickness:approx: 1/5" (5 mm) Easy to operate with the built-in spring, quick connect and release, very convenient to use. Can be used to attach to the backpack, handbag, or use as a keyring, dog leash for daily life. And used to hang crafts or decorations to anywhere you want. Round spring snap can be used to attach to the backpack, handbag, belt, purse, bottle or used as keychain, small dog leashes, DIY crafts or gifts, and much more. The small carabiner clips is convenient and quickly clips on daily life items.