Features & Specifications Polycrystalline(PCD) Diamond turning tools are generally applied in high-precision instruments such as car engine parts, photographic equipments, recorders, time pieces, optical lenses and electronic equipment s made of aluminum, copper, zinc, their alloy and polyesters. Diamond turning tools proivde a very sharp cutting edge to produce a final finish when turning. When ordering: indicate(1): What shall be cut. indicate(2): Size of diamond tip, angel and R. indicate(3): Size of metal holder