You are looking at one brand new 75 pack package of Tandy Leathercraft Medium SIze #12 1/2" (12.7 mm) Copper Rivets and Burs. This item 11280-01 are heavy duty, rust proof permanent fasteners. They are easily set with craftool copper rivet and bur setter 8110-01 which is available in our stecksstore. Thank you for looking.