You are looking at one brand new Tandy Leather Craftool Copper Rivet and Bur Setter Medium Size #12. This item 8110-01 is a strong forged steel, case hardened setting tool with light knurled cross sections. It sets copper rivet and burrs size 12 or that have a head size of 3/8" (9.5 mm): 11280-01, 11281-01 and 11282-01 which are all available in our stecksstore along with other various types and sizes of rivets, screws and grommets. If you are interested in additional quantities or other items, please feel free to contact us. Please feel free to message with any questions. Thank you for looking.