The metallurgical rolls mostly chooses high-nickel-chromium hard cast iron, alloy steel, cast high-speed steel, tungsten carbide, and other difficult-to-process materials, it has super high requirements for the impact- resistance, high temperature-resistance, and wear-resistance for cutting tools. The UHD CBN tools have higher impact resistance and wear resistance, as well as excellent heat resistance. It not only achieves higher processing efficiency, but also has super long life span.