Produce clean, smooth holes with this bi-metal self-feed bit. With a high-speed steel cutting edge for durability and a chambered edge for easy removal, you can complete your woodworking jobs in less time. This drill bit is three inches in diameter with a 1/2-inch shank, 2 1/2-inch pipe entrance, a 2 7/8-inch tubing entrance, and an overall length of seven inches. It features a replaceable lead screw and can be sharpened with a file.