... can be used widelysuitable for normal steel grinding, grinding, rough grinding, higher anti-pulls Intensity metal grinding as well, i.e.White aluminum oxideWA ... -red Sharp cutting, good edges holdout, durableSuitable for form grinding, knives, Measuring instrumentGreen silicon carbideGCgreenOnly no harder than Boron ... strength metallic and Nonmetallic material, i.e. abrasive stone cup grinding wheel