Whiteside Rounding Over Undermount Bit, 1/2 in. SH x 18 deg. is designed to soften or round the underside edge of solid surface materials up to 1/2 inch thick, making it i for undermount sink installations. This high-quality router bit features a tip-mounted nylon bearing that precisely follows the contour of the material for smooth, consistent results. It is carbide tipped for durability and has a double flute design to ensure clean cuts. Included with this bit is a BB318 bearing (3/16" ID x 7/8" OD x 18-degree bevel), enhancing its versatility and performance. Crafted by Whiteside Machine Company in Claremont, North Carolina, this bit a 1/2 inch shank size, an 18-degree cutting angle, and a 3-inch overall length for reliable operation. Model Number: 2918