Monster Tool Company 5/16 4FL DE REG TiN Carbide End Mill, 64160, Diameter: 5/16, Number of Flutes: 4, End Style: Square, Length of Cut: 3/4, Overall Length: 3-1/2, Shank Diameter: 3/8, Helix: 30-Degree, Right Hand Cut, Material Base: Carbide, Finish / Coating: TiN