【Package & Size】: You will receive 25 pcs round studs, the diameter is 12mm/0.47 inch and the thickness is 7mm/0.28inch, which is suitable for your DIY craft 【Sturdy Material】: The round studs rivets are made of alloy with an electroplating process. They are lightweight, anti rust, and resistant, not easy to fade or deform for long term use 【Easy to Install】: The alloy spikes are easy to install and remove with a screwdriver. Simply install spikes screw back into studs from the side to achieve the secure effect 【Instruction】: 1. Mark & Punch: Decide placement and punch a hole in leather/fabric. 2. Insert Screw: Push the iron screw through the hole from the back. 3. Attach Spike: Align the alloy dragon claw spike and tighten with a screwdriver. 4. Check Firmness: Ensure the spike is secure but not over tightened to avoid damage 【Wide Application】: These round head studs are great for decorating bags, shoes, boots, jackets, belts, garments, wallets, hats, handbags, clothing, and other leather craft DIY projects. If you are a DIY enthusiast, the round spikes studs kit is a great choice Specification: Material: Alloy Size Chart: 1.2cmx1.2cmx0.7cm/0.47inchx0.47inchx0.28inch Package Includes: 25  Pieces 12mm Screw Back Rivets Studs Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.