Vermont American 23142 3/16-Inch Radius Carbide Tipped Cove and Fillet Router Bit, 1/2-Inch Ball Bearing 2-Flute 1/4-Inch Shank Razor sharp cutting edge diamond honed for smooth cuts Triple tempered shank for maximum durability Industrial micrograin carbide for smooth cut For decorative edging 2 in 1 bit-extra 3/8-Inch bearing creates cove profile