Punches and dies fit a compatible knockout punch driver to create holes in sheet metal and other thin, flat materials. They replace worn punches and dies of the same size or provide a different size to make holes of a specific diameter. Punches and dies connect to a draw stud that pulls the sharp-edged punch from one side of the sheet metal toward the die on the other side to cut a clean, accurate hole. Knockout punches and dies are commonly used to make openings for conduit and wiring in electrical boxes and panels.