Monster Tool Company .021 4FL SE REG Ball Carbide End Mill, 65123, Diameter: .021, Number of Flutes: 4, End Style: BallNose, Length of Cut: 0.063, Overall Length: 1.5, Shank Diameter: 0.125, Helix: 30-Degree, Right Hand Cut, Material Base: Carbide, Finish / Coating: Uncoated