This set contains 12 new screw-back stud spikes, each measuring 12x7mm with a flat head design in a matte black finish. These rivets are commonly used for customizing leather goods, belts, jackets, or creating punk and rock-style fashion accents. The pack includes all necessary pieces for a project. Note that the material type is not specified in the provided information. Free shipping is available for this order. As dimensions and exact material composition are not listed, please check the product listing for full specifications and details before purchasing. Screw Back Stud Spike (12x7mm) 12pcs, Flat Head Stud Rivets Matt Black. Condition: New. Listed at 12.22 USD. APPLY TO - Screw back spike studs are suitable for all kinds of leather items, such as bags, belts, handbags, shoes, clothes, etc., to decorate your items while protecting your leather.SPECIFICATION:Material: Zinc AlloySurface Finish: ElectroplatingRivet Size: 12mm(Base Dia.) x 7mm(H) / 0.47-in x 0.28-inScrew Thread Size: M3(D) x 6mm(L) / M3 x 0.24-inScrew Thread Pitch: 0.5mmScrew Head Diameter: 8mm / 0.31-inQUANTITY INCLUDED - 12pcs x Screw Back Rivet StudsADVANTAGE - Made of zinc alloy material, electroplated surface finish, with good wear and corrosion resistance, flexible, durable, and not easy to deformation or rust.INSTALL - Screw design, easy to install and removable. First, punch a hole where you want it, push the screw through the hole, and finally tighten the rivets and studs with a screwdriver to complete the installation.