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, #45206, diameter (D): 7/32, cutting Height (B): 3/4, shank (D): 1/4, overall length (L): 2, plywood thickness: 1/4 minus 1/32, flutes: 2, 45206 carbide Tipped Undersized plywood dado plunge 7/32 dia x 3/4 x 1/4 inch Shank for plywood thickness 1/4 minus 1/32