Easy to operate with the built-in spring, quick connect and release, very convenient to use. Material: Zinc Alloy Quantity: 6 pieces Inner diameter:1 x 0.43''(25 x 1.1 mm).Thickness:approx: 0.2" (5 mm) GUARANTEE: 3 month guarantee, For any reason you're not completely satisfied, Please contact us, if you have any problem with installation or product quality, we will be happy to solve your problem. Carabiner Metal Spring Key Ring, Spring Keyring Buckle, Oval Ring for Bags,Purses