Greenlee 34421 Replacement Draw Stud for Knockout Punches, 3/8-Inch by 3-1/2-Inch Replacement draw stud to replace a broken draw stud for slug-buster knockout punch units The contractor's choice, worldwide Unique punch profile also splits slugs for easier slug removal Use with battery-powered, hydraulic, ratchet or manual drivers Can be used on mild steel up to 10 gauge