Knockout punch draw studs fit knockout drivers of a compatible brand and power source (ratchet, manual-hydraulic, or cordless). They replace worn or stripped draw studs and allow drivers to accept different punch and die sizes. Draw studs connect a punch and die set to a driver so it can create holes in sheet metal and other thin, flat materials. They pull the sharp-edged punch from one side of the sheet metal toward the die on the other side to cut a clean, accurate hole.