If you're into leatherworking or DIY crafts, these Chicago screw rivets are about to become your new best friend. You get 75 sets total with three different sizes - M5x6, M5x10, and M5x12mm - so you've got options for whatever project you're working on. The copper finish looks super professional and they're made from sturdy carbon steel that won't rust or wear out quickly. Installation is a breeze - just drill your holes, pop these in, and tighten with a standard Phillips screwdriver. No special tools needed! They work perfectly for leather belts, bags, wallets, bookbinding, phone cases, shoes - you name it. The threads are smooth and they fasten securely without stripping. What I love is that you can take things apart and reassemble them easily, unlike regular rivets that are permanent. The quality is really solid - no rough edges or burrs to snag your materials. Having 75 sets means you can tackle multiple projects without running out. Whether you're a professional leatherworker or just getting into crafts, these Chicago screws make your work look polished and professional. They're one of those simple hardware items that just work perfectly every time.