All sets include: 10 Rivets and 10 Burrs, Size: 1 inch Length, 1/2" head, #8 diameter 4.5mm, Made from solid copper, Very strong leather fastener for long life reliability, An inexpensive way to fasten tack, belts, shoes, etc..., Permanent and rust proof, Best when used with a rivet and burr setter, Hill Leather Company