Shanghai Main Precision Tools Co., Ltd. is leading and professional manufacturer of PCBN inserts and Super Abrasives in China. Our company is ISO9001:2000 certified. Our product line covers CBN micron powder, CBN mesh & coated products, Resin diamonds and PCBN inserts. We export our products to Europe, North America, South America and Asia. As a new type product for innovation of cutting industry, MAIN's cubic boron nitride (CBN) inserts are made by sintering nanometer CBN micro particles using micro crystallization process with high temperature and pressure. We have several registered patents of production technology for our CBN products. Polycrystalline cubic boron nitride (PCBN) is second hardest insert only next to Polycrystalline diamond. With excellent anti-fracture, good wear resistance and chemical stability, PCBN inserts are widely used for cutting tools in rough and finish