A rivet tool is a pneumatic hammer, used to drive in rivets. Made of soft aluminum alloy, stainless steel, and copper, rivets split in place like a molly bolt. After a hole is drilled between two pieces of metal, a mandrel (a nail-like object that holds the rivet in place) with an attached rivet is loaded into the rivet gun and punched through. Once in place, the remaining section of the mandrel is then removed. We have the rivet tool accessories you need to make any rivet tool work even better. Zoro also has a super selection of hand rivet tools, pneumatic tools, air riveters, air tool chisels, and pneumatic tool accessories.