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, #45444, diameter (D): 13/16, cutting Height (B): 1-1/4, Shank (D): 1/2, overall length (L): 2-7/8, flutes: 2, 45444 carbide Tipped straight plunge 13/16 dia x 1-1/4 x 1/2 inch Shank