Product Description DEWALT precision designed the 2 In. x 4 In. Core bit body to deliver the versatility and durability you need on important jobs. A hardened steel body resists breakage, and an alternating tooth design delivers longer life and quicker centering so you improve jobsite efficiency without worrying about the tool. With a low friction core body, drilling speed is increased. DEWALT's two-piece body design provides more versatility than a one-piece design, so you can rely on this product, no matter what the job. Amazon.com The DW5901 Two-by-Four Inch Core Bit Body is primarily used to drill larger diameter holes in concrete, rock, artificial stone, and other masonry products. Drill faster with the low friction core body construction and two-piece design that is more versatile than one-piece bits. Its alternating tungsten carbide teeth provide maximum durability, and also enables for quicker and easier centering. This DEWALT bit is built to last. Its hardened steel body ensures less breakage and longer life. From the Manufacturer DeWalt core bits are used primarily for drilling large diameter holes in concrete, rock, artificial stone, and other masonry materials. Common applications include drilling holes for installing pipe or conduit. These bits can be used with SDS Max and spline shank hammer drills. See more