Multifunction. Used as curtain rings. Can be used with curtain rods and clips to hang curtains in the bedroom or bathroom. Used as book rings. You can use it in your custom projects. These rings have an inner diameter of 50mm, which can even hold a handmade wooden guest book. Used as a keychain. Can be matched with swivel clasps for hanging small items. They work perfectly and stay closed when completely full. Product details: Solid rivet. Made of high quality metal, nickel finish, rust resistant, can be used for a long time, not easy to break. Close tightly. Please push up and down first, then pull left and right when opening. Easy to open and close. Clip seal. Special groove design, easy to mesh closer, not easy to loosen. Avoid them opening on their own. Used for crafts, art display or home decoration.