3020 Led Chip,3020 Light Strips Led Chips,White Color Led Grow Light Bar,3020 Smd Led Chip Shenzhen Huangtai Photoelectric Co.,Ltd. , https://www.huangtailed.com Metal cutting tools are important tools in cutting. Commonly used are high speed steel (such as W18Cr4V, W6Mo5Cr4V2), powder high speed steel, coated high speed steel (such as PVD coating), fine grain and coated hard alloy (such as adding TaC, NbC YG type), composite ceramics (such as Si3N4 based), cubic boron nitride (such as PCBN)