Solid Carbide Endmills H680 Series for Hardened steel, up to HRC 65 (High Precision Cutting) Solid Carbide Endmills Ultra grain carbide rods with better abrasion resistance. Use SICO-TH coating with anti-high temperature & anti-oxidation. Special geometry design, suitable for high hardened working materials. Comparable to Europe, America, Japan’s tolerance with high precision and high performance on Finishing working situation. Long Tool life tools reduce tool costs and working cost effectively. High Precision High Speed High Hardened A013