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, #45245, diameter (D): 1/2, cutting height (B): 1-1/4, Shank (D):, /4, overall length (L): 2-1/2, flutes: 2, 45245 carbide Tipped straight plunge high production 1/2 dia x 1-1/4 x 1/4 inch shank