The surface is smooth and will not scratch your hands. Our tubular rivets are ideal for repairing broken belts, leather crafts, DIY clothing, shoes, leather goods, bags, jeans, hats, jackets, pet collars, and adding decorative elements. Double cap rivets are available in 3 sizes: 6x6mm, 8x8mm, and 8x12mm, and come in 3 colors: Gold, Silver, and Bronze, suitable for various project needs. For clothing applications, ensure your fabric thickness does not exceed the rivet length. Simply punch a hole and screw on the rivet. Easy to use for adding stylish rivet details to your items.The compact and portable storage box keeps all rivets and tools organized in a transparent case. This 300-piece leather crafting set includes 4 installation tools: 1 punch, 1 installer, 1 base, and 1 pair of punching pliers.Color: Gold + Silver + Bronze Material: Iron Package Contents: 1 set x rivet installation tools (rivets and tools only; other items not included)Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.