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. 45193 features a solid carbide cutting edge, #45193, diameter (D): 13/32, cutting Height (B): 1, shank (D): 1/4, overall length (L): 2-1/2, flutes: 2, 45193 carbide Tipped straight plunge high production 13/32 dia x 1 x 1/4 inch Shank