Task Tools T24177 Round Nose Router Bit with 1/4-Inch Shank, 1/4-Inch by 1/2-Inch Carbide Height, 1/8-Inch Radius Round nose 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: 1/4-inch diameter by 1/2-inch carbide height; 1/8-inch radius