45223, Amana Carbide Tipped Undersized Plywood Dado Plunge 15/32 Dia x 3/4 x 1/4 Inch Shank for Plywood Thickness 1/2 minus 1/32

Use a two-flute bit where fine finish is paramount. Two flutes balance the bit, eliminating vibration that degrades the cut finish. Two cuts per revolution yield a smooth surface, but feed rate is slightly reduced.