Polycrystalline diamond ( PCD ) with character of high hardness, good wear resistance. Compared with tungsten carbide, PCD tensile strength is 70% of tungsten carbide, but hardness is 250 times than tungsten carbide. SUPREME PCD drawing die has good wear resistance, uniform abrasion of inner hole, strong shock resistance, high drawing efficiency, the price is much cheaper than natural diamond die, and can reach big diameter. It is widely used in drawing industry.