Amana Tool 55400 Tongue and Groove 1-5/8-Inch Diameter by 3/4-Inch Cutting Height Router Bit For 1/2 through 3/4-Inch material 1-5/8 Diameter, 3/4-Inch Cutting Height, 1/2-Inch Shank Cuts Tongue and Groove 3/8-Inch deep Carbide Tipped, Industrial Quality Two-Wing. Includes removeable slotting cutters, arbor and bearings.