Monster Tool Company 5/16 4FL SE REG TiCN Carbide End Mill, 61907, Diameter: 5/16, Number of Flutes: 4, End Style: Square End, Length of Cut: 13/16, Overall Length: 2-1/2, Shank Diameter: 5/16, Helix: 30-Degree, Right Hand Cut, Material Base: Carbide, Finish / Coating: TiCN