10 Pack includes 10 rivets and 10 burrs Very strong leather fastener for long life reliability An inexpensive way to fasten tack, belts, shoes, etc... Permanent and rust proof #12 Size is a medium diameter rivet about 1/8" diameter shaft Head diameter is 3/8" (W) Rivet is 3/4" (L) Best when used with a #12 rivet and burr setter