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, #57158, diameter (D): 2, angle (a°): 14°, radius (r): 1/2, 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, 57158 carbide Tipped undermount bowl Solid surface 2 dia x 11/16 x 14 Deg X 1/2 inch Shank