These metallic black stud rivets are made from durable zinc alloy, offering high hardness and resistance to rust, wear, and corrosion. Their polished, sealed finish provides a sleek surface free from scratches and dust, ensuring water resistance. The set includes 15 round head button nipple screws with a 12mm ball head, designed for easy installation and removal using a screw back mechanism. To install, punch a hole in your leather item, insert the screw, cover with the button stud, and tighten with a screwdriver. These rivets are suitable for attaching small straps and belts to backpacks, handbags, purses, and more. They can also be used as stylish DIY accessories and decorations. The striking metallic black color adds a bold touch to any project. Each set provides ample rivets and screws for various crafting needs, combining functionality with a refined appearance.