Save time and money with every punch. Greenlee 7212SP-3/4P Punch. From the leaders in knockout technology comes the new speed punch System. The patent pending "no-thread" design eliminates cross-threading, while the innovative speed lock mechanism quickly secures the punch in place. This means longer tool life and faster punches, saving you time and money on the job. Up to 3 times faster setup and disassembly. Made of nickel plated carbon steel.