Gardner Bender 3 in. Mechanical Knockout Set

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 in. 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 in. conduit; actual hole diameter is of 3.542 in. Additional sizes are available to specifically permit fast and easy installation of electrical conduit and pipe of nominal sizes 1/2 in. through 4 in., in all commonly available increments.