Product Description The IRWIN 2-inch Self-Feed Wood Drill Bit is great for drilling large-diameter holes in wood for pipe, conduit and other applications. The wood drill bits have a replaceable coarse screw point to drill quickly in dry, wet and gummy wood. The self-feed drill bits have a precision-milled shank to help eliminate runout and wobble and are forged in 1 piece from high-carbon steel for high strength under tough drilling conditions. Each self-feed bit has a 7/16-inch hex quick-change impact shank that fits most 1/2-inch or larger electric drills or 7/16-inch hex impact wrench drills. From the Manufacturer Irwin Industrial Tools 43032 2-Inch Self Feed Bit. For fast, rough or clean and exact holes, Irwin's extensive line of woodboring drill bits provide the user with the best available tools for each application in achieving their wood drilling needs.