RUBYCA 30 Sets Black Gunmetal Head Button Studs and Posts, Metal Screwback Studs, Chicago Screws for Leather Crafting 9mm X 6mm Package Includes: 30 Sets of Head Button Screwback Studs w/ Chicago Screws, Leather Craft Accessories Material: Top Quality Zinc Alloy Metal &#10084 Come with Genuine RUBYCA Zip-Bag Screw Type: Phillips / Slotted &#10084 Shape: Round Base Button Shape Color: Gunmetal Black &#10084 Size: 9mm = 11/32 (Height) &#10084 Base Diameter Size: 6mm = 1/4 Use in leather accessories, jackets, belts, shoes or bags &#10084 Great diy crafts & decoration supplies