Bluemoona One Pcs - Hook Swivel Multi Removeable Detatchable Key Ring Keychain Clip Release Keyholder Accessories (Style A) Size: total are 4" or 102mm Functional, high quality design,Key rings easily detach and then reattach to master unit Material:Metal color: Nickel Use for:keychain, key, school, home,Keyholder,office,garden, Card