Knockout Punch, 1 1/8" SizeMfr #: K2P 3 4 3 4" CONDUIT KNOCKOUT PUNCH: Makes it quick and easy to punch conduit up to 3 4" (1. 12" or 28. 3 mm.) in size to create clean, precision holes every time PUNCHES A VARIETY OF MATERIAL: Optimized for mild steel and has a limited stainless steel capacity, and it can also punch brass, copper, aluminum, fiberglass, and plastics EASY SLUG REMOVAL: Features a unique punch profile that effortlessly splits slugs to allow for easy slug removal