Amana 49508 Roundover Router Bit 5/16 Radius, 1/4 Shank Carbide Tipped Radius 5/16 Diameter 1-1/8 Cutting Length 1/2 Shank Diameter 1/4 Overall Length 2-1/16 2 Flute With Ball Bearing Guide Availability: Usually ships the next business day Amana 49508 Roundover Router Bit 5/16 Radius, 1/4 Shank amrorobit499