Features:【Durable Material】These stud earrings are made of high quality iron with a fine finish, no casting lines, fine workmanship and durable. And screws are made of iron.【Size and Colors】Various 150 sets of Chicago screws in 5 colors (Black + Bronze + Silver + Red Copper + Gold), diameter of round head: 9mm, height of tube: 6mm, height of screw: 4mm.【Easy to Use】Choose the matching color of the tube, insert the bolt through the hole, align the nut with the bolt and tighten the bolt with a screwdriver. Use the punching tool to make a hole if necessary. You will definitely look cool with your DIY project, wonderful products that you can't miss.【Scope of delivery】150 sets of Chicago screws together with 2 installation tools in a transparent plastic storage box.【Wide Application】These leather craft rivets are especially suitable for DIY various leather crafts, as fixed or decorative items. For example: belt connection, bag decoration, clothing decoration, key pocket nails, stationery nails, photo album nails, calendar screws, booking, etc. Specification:Material: ironProduct type: Screw rivetsMeasurement system: MetricSize: 4mm 5mm 6mm 9mm- Post diameter: 5mm.- Screw and base diameter: 9 mm.- Post length: 6 mm.- Screw length: 4 mm. Color: Black + Bronze + Silver + Red Copper + GoldFinish: Chrome platedShape: Flat squareQuantity: 150 piecesPackage size: 12.7 x 6.5 x 2.2cm Package Include:( quantity x size x color )Rivets:30 sets ----- 5 x 6 x 9mm / 4 x 6mm Bronze 30 sets ----- 5 x 6 x 9mm / 4 x 6mm gold 30 sets ----- 5 x 6 x 9mm / 4 x 6mm Red Copper30 sets ----- 5 x 6 x 9mm / 4 x 6mm Silver 30 sets ----- 5 x 6 x 9mm / 4 x 6mm Black 1 piece ----- Screwdriver1 piece ----- Hole punchAll in a practical plastic box.