150 sets of double cap leather rivets including 6 sizes (M5x4MMx40 sets, M5x5MMx30 sets, M5x6MMx30 sets, M5x8MMx20 sets, M5x10MMx15 sets, M5x12MMx15 sets), multiple sizes will meet your different DIY needs. We will also a screwdriver for your better use. Screw rivets are made of high quality carbon steel, surface without burrs, anti-rust and anti-corrosion, tough and durable, perfect for leather crafts, clothing decoration, etc. Rivets are perfect for DIY leather crafts such as belts, wallets, keychains, , shoes, jackets, hats and more. It can also be used to fix items to documents, books, albums, calendars and other crafts. the right rivets for leather, put the stud through the hole, then insert the nut into the stud and tighten it with a screwdriver and you're done. Note: Screws are small gadgets, keep from children. All rivets are sorted by size and placed in the storage box, which is easy to use, and carry. Colour:black Material:carbon steel Package Contents: 1 set x diy leather bag kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.