Polycrystalline cubic boron nitride (PCBN) are produced by sintering  cBN  powders with various ceramic and metalic binders . CBN is the second hardest material known, after diamond, but has high thermal and chemical resistance. PCBN tools are used for the machining of hardend steels irons and powder metals. EHWA PCBN tools are widely used as the most suitable solution in various industries such as automobiles, general machinery and bearings where heat-treated steel is used.