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Polycrystalline Diamond wire drawing die Blanks is diamond crystal block of diamond particles and catalyst cobalt sintered under high temperature and ultrahigh pressure. It has the wear resistance, hardness and good thermal conductivity of natural diamond and the similar toughness of hard alloy. It has a long useful life and can be used in drawing of many kinds of alloy, such as stainless steel, tungsten, molybdenum and aluminum.