... ZrO increases.3. Only no harder than Boron carbide and Diamond, friable, its girt is sharp, and Thermal conductivity4 ... can be used widelysuitable for normal steel grinding, grinding, rough grinding, higher anti-pulls Intensity metal grinding as well, ... speed steel, High-carbon steel,Chromium corundumPAPink,rose-red Sharp cutting, good edges holdout, durableSuitable for form grinding, knives, ...