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Match the length of your rivet to the thickness of your materials. Choose single cap rivets for one-sided projects. Use a double cap rivets for two-sided projects. Select copper rivets for a sturdier finish.
The rivet should be long enough to get through the material you're using with about 1/8 inch (0.3 cm) to spare. Stack your materials together and measure their height, then add the additional 1/8 inch to find out how long your rivet should be. If your rivets will only be visible from one side like if you're decorating on a leather bag no one will see the inside of you can use a single cap rivet. This will give your project a finished look. If you're making something that you can see the front and back of like the strap of a purse, for example use double-sided rivets. You install these the same way as single cap rivets they just give your project a more finished look. Copper rivets are stronger than regular, silver, "quick" rivets. They're great for using on any leather work that needs some extra strength.