Greenlee 730BB-3/4 Standard Round Knockout Punch Unit, 3/4-Inch Round standard metal punch units are complete units consist of punch, die and draw stud Use with battery-powered, hydraulic, ratchet or manual drivers Properly assembled through pilot holes, they will make clean, fast and accurate holes Slug falls free in die Can be used on mild steel up to 14 gauge.The size referenced on the product is referring to the size of the conduit, not the size of the product itself