Our rivets and studs are made of nickel free copper, rustproof and ,not easy to bend, deform and fade,strong and sturdy. The is smooth and don't scratch your hands. Our tubular rivets are good for repairing broken belt, leather craft, DIY clothes, shoes, leather boots, bags, jeans, hats, jackets, pet collars, adding ornaments and so on. Double cap rivets have 3 sizes: 6x6mm; 8x8mm; 8x12mm. 3 colors: Gold, Silver, Green Bronze, which can cater to your different needs in . Studs for clothing: please make sure that your fabric is not thicker than the rivet size. Just need punch a hole and screw on. It's easy to add your favorite rivets elements to your . The storage box is compact and easy to carry, all rivets and tools are neatly placed in a transparent storage box. 300 sets leather working tools and supplies come with 4 fixing tools: 1 punch, 1 rivet installer, 1 base, 1 punching pliers. Colour:Gold + Silver + Bronze Material:iron Package Contents: 1 set x rivet Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.