... 1.abrasive tools should be written according to the order, shape, size, abrasive material, grain, grade,and speed2.Suitable ... carbideGCgreenOnly no harder than Boron carbideSuitable for grinding Hard alloy, Optical glass, vitrify and other hard friable materials.Black silicon ... wheeltype 4 Tapered two sides wheel,type 5 recessed one side wheel,type 6 straightcup wheel,type 7 recessed two sides ...