Description Made of copper with electroplated outer layer. It is hard, stable and has a smooth surface and will never fall off. It is specially designed for pin use, suitable for pins, insignia, name tags, display books, lanyards, bags, vests, hats, badge, collectibles, pin Locks and so on. Features - Color: Silver. - Material: Copper. - Packing Size: 6x6x2cm/2.36x2.36x0.79 inch. - source material make it more useful and not easy to break. - It is hard, stable and has a smooth surface and will never fall off. - Application: clothes, trousers, shoes, bags, leather, belts. - Place the pin keeper on your favorite pin, then use a wrench to the screw into the pin keeper and secure it. - Can keep your firmly in your suit, vest, hat, jeans, bag, no need to worry about the pin will fall off due to exercise.Package list: 1 x Set of 40pcs Locking Pin Back Set