Amana Tool 57149 Carbide Tipped Corner Rounding with Ultra-Glide BB Guide Solid Surface 1 Inch D x 1/2 CH x 1/4 R x 1/2 SHK Router Bit Carbide Tipped SPECIFICATIONS: Diameter (D): 1 Radius (R): 1/4 Cutting Height (B): 1/2 Shank (d): 1/2 Overall Length (L): 2-7/16 Flutes: 2