Set of 12 C.S. Osborne Copper Rivets & Burrs. CS Osborne 3/4" Long Solid Copper Rivets and Burrs. Heavy duty, rust proof permanent fasteners. They are easily set with Osborne No.170-9 rivet setter. Made in USA. Size Number : 9 Diameter under head (inches) : 0.161 Overall length : 3/4" Tool to be use : Osborne No. 170-9 You will receive 12 each of rivets and burrs