Greenlee 60115 Replacement Draw Stud for Knockout Punches, 1/4-Inch by 3-7/16-Inch Replacement draw stud to replace a broken draw stud for Slug-Buster knock out 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