Task Tools T24165 Core Box Router Bit with 1/4-Inch Shank, 5/8-Inch by 1/2-Inch Carbide Height, 5/16-Inch Radius Core box router bit with 1/4-inch heat-treated, hardened steel shank; double flute for quick cuts Dynamically balanced up to 24,000 RPM to reduce vibration and kickback Non-stick powder coat finish reduces friction and resin build-up to protect from corrosion Premium quality Super Fine Grain Tungsten Carbide for an exceptionally smooth finish Size: 5/8-inch diameter by 1/2-inch carbide height; 5/16-inch radius