Monster Tool Company 1 4FL SE REG AlTiN Carbide End Mill, 61990, Diameter: 1, Number of Flutes: 4, End Style: Square End, Length of Cut: 1-1/2, Overall Length: 4, Shank Diameter: 1, Helix: 30-Degree, Right Hand Cut, Material Base: Carbide, Finish / Coating: AlTiN