The positions of the bead and the cove are reversed on this Series of bits, with the bead coming off the bearing. With the optional 3/8" Pilot bearing, the bit produces a fillet at the base of the bead. Largest diameter bits should be run at reduced speed. Use in a handheld or table-mounted router.#54130, diameter (D) 1-3/8, radius (r) 1/4, cutting Height (B) 11/16, shank (d) 1/4, overall length (L) 2-3/16, R1 3/16, flutes 2, 54130 carbide Tipped classical cove & bead 1/4 x 3/16 radius x 1-3/8 dia x 11/16 x 1/4 inch Shank