CBN (cubic boron nitride), the tool features that it can process materials with high hardness. Its cutting speed is several times that of ceramic inserts, which can significantly increase the output. The polished parts processed have a very good finish. Generally, grinding is not required, but it is not suitable for rough turning. The cutting allowance is generally 10 wires. The hardness is generally above 45 ° Rockwell hardness, such as bearing steel, hot work pieces, and different CBN materials are selected according to different steel materials