Millstar 3mm Carbide Ball End Mill HSN Finish 4 Flute USA Made

Solid carbide provides better rigidity than high speed steel. It is extremely heat resistant and used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials. 

HSN is a multi-layer hybrid nano coating that has very good heat resistance and high a hardness. The HSN coating is designed for use on heat treated materials up to 72 HRc.