Monster Tool Company 5/16 4FL SE X/LG BN 1 5/8x4 TiN Carbide End Mill, 63878, Diameter: 5/16, Number of Flutes: 4, End Style: BallNose, Length of Cut: 1-5/8, Overall Length: 4, Shank Diameter: 5/16, Helix: 30-Degree, Right Hand Cut, Material Base: Carbide, Finish / Coating: TiN