Amana Tool MRR108 Miniature 1/16 Radius Corner Rounding with 3/16 Dia Ball Bearing x 5/16 Dia x 5/16 Cut Height x 1/4 Inch Shank Carbide Tipped Router Bit Carbide Tipped SPECIFICATIONS: Diameter (D): 5/16 Radius (R): 1/16 Cutting Height (B): 5/16 Shank (d): 1/4 Overall Length (L): 1-13/16 Replacement Bearing: 47775 Flutes: 2 D1: 3/16