These bits are designed for routing architectural and furniture moldings and trim. Almost all have the profile laid out vertically, reducing the diameter of the bit. These bits should be used in a 2+ horsepower, table-mounted router, and many should be run at reduced speed. Although most have ball-bearing guides, guiding the cuts with the fence is recommended.#54224, diameter (D) 1-3/8, radius (r) 1/8, cutting Height (B) 1-5/8, Shank (d) 1/2, overall length (L) 3-1/2, R2 1/4, replacement bearing 47706, R3 7/16, R1 1/16, flutes 2, 54224 carbide Tipped classical architectural molding 1/8 x 5/32 x 5/32 radius x 1-3/8 dia x 1-5/8 x 1/2 inch Shank