Gardner Bender KOS-500B Slug-Out Mechanical Knockout Set, Contractor Punch, Die Drive Screw, oe" Conduit Pipe Size Cutting Diameter, 10 AWG Mild Steel 12 AWG Stainless Steel Product Description 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 and drive screw to punch a hole diameter sufficient for 1/2 inch diameter pipe/conduit; actual hole diameter is .873 inches. Additional sizes 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. From the Manufacturer Slug-Out Individual Punch and Die. Four-point design allows slug to drop automatically without splitting. Superior quality at an affordable price Features Four-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 Actual hole diameter 0.873 inches USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.