Solid Carbide Endmills H650 Series for Hardened steel, up to HRC 60 Solid Carbide Endmills Ultra grain carbide rods with better abrasion resistance. SICO coating with anti-high temperature & anti-oxidation. ARCO coating shows good performance in coolant machining. Large core diameter promote its rigidity of the tool. Negative rake angle design is suitable for machining hardened material. Long tool-life and good performance in hardened steel material. A021