Gardner Bender KOM300 Slug-Out Mechanical Knockout Set, Contractor Punch, Die & Drive Screw Set, Conduit Pipe Size Cutting Diameter, 3½" Hole Size, Punches 10 AWG Mild Steel & 12 AWG Stainless Steel, 3"

Gardner Bender four-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 .135 inches in thickness. Punches and dies are interchangeable, in any combination, with most brands of knockouts. This kit includes punch, die, drive screw and drive nut to punch a whole diameter sufficient for 3 inch conduit; actual hole diameter is of 3.542 inches. Additional sizes are available to specifically permit fast and easy installation of electrical conduit and pipe of nominal sizes 1/2" through 4", in all commonly available increments.