Rivets and studs are made of free copper, rustproof and durable, not easy to bend, deform or fade, strong and sturdy. The surface is smooth and won't scratch your hands. Tubular rivets are ideal for repairing broken belts, leather crafts, DIY clothing, shoes, bags, jeans, hats, jackets, pet collars, and adding ornaments. Double cap rivets are available in 3 sizes: 6x6mm, 8x8mm, and 8x12mm, and 3 colors: Gold, Silver, and Bronze, suitable for various needs. Studs for clothing: ensure your fabric is not thicker than the rivet size. Simply punch a hole and screw on. Easy to attach your favorite rivets to your projects. The compact storage box is portable, with all rivets and tools stored in a transparent case. This 300-piece leather working kit includes 4 fixing tools: 1 punch, 1 rivet installer, 1 base, and 1 pair of punching pliers. Color: Gold + Silver + Bronze. Material: Iron. Package Contents: 1 set x rivet press. Only the items listed are included; others are not. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3cm.