The Greenlee 7212SP-1D Knockout Die is the perfect tool for punching holes in steel, aluminum, fiberglass and plastic. It has a 3 times faster setup and disassembly feature which makes it easy to use. The speed punch standard round slug splits in half, falls free from die and stud. This knockout die can be used with Greenlee manual, hydraulic or battery operated knockout drivers. The 1 1/4" conduit and pipe size offers maximum capacity of 10 ga mild steel. The Greenlee Knockout Die is an efficient tool that will make your job easier.