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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, #45422, diameter (D): 1/2, cutting Height (B): 1-1/2, Shank (D): 1/2, overall length (L): 3 -1/8, flutes: 2, 45422 carbide Tipped straight plunge 1/2 dia x 1-1/2 x 1/2 inch Shank