Monster Tool Company 1/4 4FL SE REG w/.020R Carbide End Mill, 62146, Diameter: 1/4, Number of Flutes: 4, End Style: Corner Radius, Length of Cut: 3/4, Overall Length: 2-1/2, Shank Diameter: 1/4, Helix: 30-Degree, Right Hand Cut, Material Base: Carbide, Finish / Coating: Uncoated