Use this bi-metal self-feed bit on wet wood, hardwood, and 4x4s. Designed with a chambered, high-speed steel cutting edge, this bit is ideal for producing clean holes with the strength to cut through nail-embedded wood. This drill bit has a replaceable lead screw and can be sharpened by file. It has an overall length of seven inches with a diameter of 4 5/8 inches, a 1/2-inch shank, a four-inch pipe entrance, and a 4 1/2-inch tubing entrance.