This rivet gun is a heavy-duty hand riveting tool that sets rivet sizes 3/32"-3/16". It features a square shoulder fulcrum pin of cold-formed heat-treated steel that prevents pin rotation that can elongate the hole that the rivet is intended for and prevents premature tool failure. Made from high quality die cast aluminum alloy, with forged steel handles with added cushions for comfort. Comes with four mounted nosepieces: 3/32", 1/8", 5/32" and 3/16".