CBN H600 is a product of hi-tech synthesis of cubic boron nitride. The color of crystals is black with inclusions of dark-brown grains with dense metallic brilliance and interchanging transparent and non-transparent sectors. Its typical crystallographic forms are combinations of tetrahedron and octahedral habitus. CBN H600 is mainly presented with monocristals with long, pronounced cutting edges. Mechanical strength of CBN H600 crystals is 1,5 times higher than that of CBN H200. If a tool of CBN H200 at work needs lower power consumption, CBN H600 is preferable when higher specific compression force and advance speed are needed. These properties in combination with high thermal stability ensure high performance of CBN H600 at aggressive grinding of fast-cutting steels, alloys, based on nickel and cobalt, as well as grinding of solid cast iron >45 HRc.