description designed to punch a maximum of 10 gauge (.134?) mild steel up to 2? and, with optional piece maker ss punches and dies, 10 gauge (.134?) stainless steel up to 1 1/4? designed to split the slug into two pieces for easy removal high strength steel punches and dies for long life requires less force than conventional punches all items including punches dies will fit Greenlee knockout sets compare with Greenlee quick draw model 7806sb* superior pressure relief valve minimizes wear and leakage made in the USA *Greenlee and quick draw are registered trademarks of Greenlee tools, inc. 811993020957