RUBYCA 100 sets 13MM Black Gunmetal Color Bullet Cone Spike Stud Metal Screw Back DIY Leather-craft Package Includes: 100 Sets of Cone Spikes Screwback Studs with Screws for Leather-Crafting Material: Top Quality Zinc Alloy Metal &#10084 Come with Genuine RUBYCA Zip-Bag Screw Type: Phillips / Slotted &#10084 Shape: Round Base Bullet Cone Spikes Color: Black Gunmetal &#10084 Size: 13mm = 1/2 (Height) &#10084 Base Diameter Size: 7mm = 9/32 Use for leather accessories, jackets, belts, shoes, bags &#10084 Great diy crafts & decoration supplies