Produce clean, smooth holes using this bi-metal self-feed bit. With a high-speed steel cutting edge for durability and a chamfered edge for easy removal, you can complete your woodworking jobs in less time with minimal effort. This drill bit is 1 3/8 inches in diameter with a 1/2-inch shank, a one-inch pipe entrance, a 1 1/4-inch tubing entrance, and an overall length of seven inches. It features a replaceable lead screw and can be sharpened with a file.