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, #45402, diameter (D): 3/8, cutting Height (B): 1, shank (D): 3/8, overall length (L): 2 -1/2, flutes: 2, 45402 carbide Tipped straight plunge 3/8 dia x 1 inch x 3/8 shank