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, #45224-01, diameter (D): 1/2, cutting height (B): 3/4, shank (D): 1/4, overall length (L): 2-1/4, flutes: 2, 45224-01 carbide Tipped straight plunge high production 1/2 dia x 3/4 x 1/4 inch shank