GGreenlee 739BB Standard Round Knockout Punch Unit, 3-"
332-739BB Features: -Round Standard Metal Punch Units are complete units consisting of punch, die and draw stud. -Use with manual, ratchet, hydraulic or battery-powered drivers. -Properly assembled through pilot holes, they will make clean, fast and accurate holes. -Applicable Materials: Mild Steel. Product Type: -Punches. Dimensions: Overall Product Weight: -5.53 Pounds.
From the Manufacturer
Greenlee round standard metal punch units are complete units consisting of punch, die and draw stud. They can punch quick clean holes through metal up to 10 gauge (check specs for specific punches). They can be used with battery-powered, hydraulic, ratchet or manual drivers. Properly assembled through pilot holes, they will make clean, fast and accurate holes. After cutting the slug falls free in the die, and a quick tip drops it out.