Set contains 4 punch and die sets, and high impact plastic case | 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 10-GaugeAmazon.ca Product Description KO SET, SR, 2-1/2" - 4" 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. Kit includes punches and dies for 2-1/2, 3, 3-1/4 and 4-Inch conduit.