Round head button studs craft from alloy metal, rust resistant, good durability, not easy to break, for long time use. Round Head Button Studs Diameter: 3 different size: 4MM; 7MM; 8MM. Choose as your need. Round head button studs with installation tool, enough quantity to meet your crafting need for leather craft. Easy to Use. These button studs features screwback spots, round base. Easy to screw on. Widely used for repair and decorating your leather shoe, belts, handbag, bags, purses, jackets, jeans, wristbands, hat, dog collars, clothing, leather bracelets, wristband, necklaces and more leather craft making.