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, #45249, diameter (D): 5/8, cutting height (B): 1-1/4, Shank (D): 1/4, overall length (L): 2-7/8, flutes: 2, 45249 carbide Tipped straight plunge high production 5/8 dia x 1-1/4 x 1/4 inch shank