Mill Diameter Inch 58 Number of Flutes 2 Material High Speed Steel Length of Cut Inch 4 Shank Diameter Inch 58 FinishCoating Bright Single or Double End Single Center Cutting Yes Overall Length Inch 618 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