Greenlee 77U-1/2 Slug-Buster Self Centering Knockout Punch Unit for 1/2-Inch Conduit
Greenlee Slug-Busters can be used on mild steel up through 10 gauge (3.5 mm). Application: Punch mild steel, aluminum, fiberglass and plastic. Hole size is outside diameter of US conduit sizes. Example: 1/2-Inch conduit size punch actually makes a 7/8-Inch hole. Operates with battery, hydraulic, ratchet or manual drivers. Punch unit sets include punch, die, and draw stud.