Binding screws are widely used for DIY projects such as belts, handbags, shoes, clothes, leather bracelets, books, scrapbooks, photo albums, leather saddles, wallets, cookbooks, presentation folders, advertising brochures and so on. It's an useful accessory for your daily life.SpecificationColor: Red BronzeMaterial: Nickel plated carbon steelThick of Screw & Post: 1.5mm/0.06 inchHead Diameter of Screw & Post : 9.5mm / 0.374inchScrew Diameter: 4mm / 0.157inchPost Diameter: 5mm / 0.2inchPost-Length: 10mm/ 0.39inch; 20mm/0.79inch; 30mm/1.18inch; 40mm/1.57inch; 50mm/1.97inchScrew Length: 5mm/ 0.2inch100pcs chicago screws with post (10pairs M5x10+10pairs M5x20+10pairs M5x30+10pairs M5x40+10pairs M5x50).