Round Flat Head Chicago Screws Buttons for Leather Crafting, 1/4 Inches (6mm) Repair Screw Post Fastener, Metal Nail Rivet Studs, Black Gunmetal, 30 Sets, Diameter 5/16 Inches (8mm) Package Includes: 30 Sets &#10022; Color: Gunmetal Black &#10022; Diameter: 5/16" (8mm) &#10022; Length: 1/4" (6mm) Material: Top Quality Zinc Alloy Metal &#10022; Screw Type: Phillips / Slotted &#10022; Shape: Flat Round Head &#10022; Packaging: RUBYCA Zip-Bag. Fabric Denim or Leather Craft Accessories Decorative Supplies - alternative to rivets, only a screwdriver needed to install or remove. Commonly used in DIY leathercraft: bookbinding, fasten belt buckles, wallet, album, purse, bag, watch strap, jackets, etc. Known as Chicago Screws, Fasteners or Bolts, Sex Bolts, Screw Posts, Barrel Nut, Connector Bolt, Barrel Bolt, etc.