Brand Name: Gardner Bender | Diameter: 1/2 in. | Length: 1 in. | Material: Stainless Steel | Number in Package: 2 pc. | Packaging Type: Carded | Sub Brand: Slug-Out | Usage: Designed to punch clean, round holes through 10-ga Gardner Bender 4-point knockout punches and dies are designed to punch clean, round holes through 10 gauge mild steel, 12 gauge stainless steel or other soft metals up to 0.135 inch in thickness. Punches and dies are interchangeable, in any combination, with most brands of knockouts. This kit includes punch, die and drive screw to punch a hole diameter sufficient for 1/2 inch diameter pipe / conduit, actual hole diameter is 0.873 inch additional sizes available to specifically permit fast and easy installation of electrical conduit and pipe of nominal sizes 1/2 inch through 4 inch, in all commonly available increments. | 0.873 inch actual hole diameter | 4-point punch design allows slug to fall free from the die without splitting, tapping or prying | Interchangeable with most tool brands | Punches 10 gauge mild and 12 gauge stainless steel | Punches hole designed for 1/2 inch pipe or conduit