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, #45409, diameter (D): 9/32, cutting Height (B): 3/4, shank (D): 1/2, overall length (L): 2 -3/4, flutes: 2, 45409 carbide Tipped straight plunge high production 9/32 dia x 3/4 x 1/2 inch Shank