A double quarter-round profile is produced by this tool. The depth-of-cut setting determines whether or not a fillet is formed at the top. Switching from the standard pilot bearing to the optional 3/8" Bearing introduces a fillet at the bottom of the profile. Use in a handheld or table-mounted router.#54138, diameter (D) 1-3/8, radius (r) 7/32, cutting Height (B) 11/16, shank (D) 1/4, overall length (L) 2-3/16, replacement bearing 47706, flutes 2, 54138 carbide Tipped classical molding 7/32 radius x 1-3/8 dia x 11/16 x 1/4 inch Shank