Features 1. Made of quality nickel-plated copper, small and sturdy; The metal material makes it durable and colorfast, giving you an incredibly sturdy and safe experience; The small size makes it unobtrusive while maintaining stability. 2. How to use: Put the black screw into the middle hole, then use a small wrench to screw half of the black screw to ensure that the fixed, fixed into the brooch or medal needs to be fixed to the other two ends of any small hole, then use a wrench to tighten the black screw gradually, to ensure that the fixed. 3. Suitable for locking pin backs also are suitable for pins, insignia, name tags, display books, lanyards, bags, vests, hats, badge, collectibles, and so on. You can pin your badge on clothes, bags or jeans. 4. Quality Guarantee. We have faith in our product and always back it up with trustful customer service, please reach out to us if you have any questions or problems about our products. Specification Material: Copper Color: Silver Package Includes: 100 x Pin Keeper 10 x Wrench