These bits are designed specifically for use in undermount installations of Corian bowl #874-s. They trim and profile The counter-top edges after the bowl is mounted, #57156, diameter (D): 1-25/32, angle (a°): 17°, radius (r): 3/8, cutting height (B): 11/16, shank (D): 1/2, overall length (L): 2-1/2, B1: 17/32, Type: Round over, replacement bearing: 47731, flutes: 2, a: 1/2, 57156 carbide Tipped undermount bowl Solid surface 1-25/32 DIA x 11/16 x 17 Deg x 1/2 inch shank