Mill Diameter Inch 12 Number of Flutes 2 Material High Speed Steel Length of Cut Inch 3 Shank Diameter Inch 12 FinishCoating Bright Single or Double End Single Center Cutting Yes Overall Length Inch 5 Flute Direction Right Cutting Direction Right Variable Helix No Helix Angle 42 The 2 flute end mills for aluminum have high helix flute design making them well suited for milling aluminum and other nonferrous materials