Faithfull Router Bit Tungsten Carbide Ovolo 13.3 mm. Designed to meet the needs of both the professional tradesman & the home handyman. All are Tungsten Carbide Tipped, to ensure longevity of working life, coupled with a good quality finish to the work. Ovolo produces a stepped rounded profile along the edge of the material. The guide pin enables the cutter to follow intricate shapes. 1/4 in. Shank. Radius 6.3 mm. Depth of Cutter 13.3 mm. Shank Diameter 1/4 in.