Cut a thumbnail in a single pass, flanked top and bottom by a fillet and a cove, a combination Often called an astragal. Three sizes scaled for stock 3/4" Through 1-1/2" Thick. Should be used in a table-mounted router. The tool is equipped with a ball-bearing guide for template work.#51530, diameter (D) 1-1/8, Radius (r) 1/8, cutting Height (B) 1, shank (D) 1/2, overall length (L) 2-7/8, replacement bearing 47716, R1 1/4, flutes 2, 51530 carbide Tipped bullnose/cove edge 1/8 x 1/4 radius x 1-1/8 dia x 1 inch x 1/2 shank