... holdout, 3.stronger flexibility than WA,1.vitrified grinding wheel cover various specifications of vitrified abrasives with the ... is sharp, and Thermal conductivity4 Suitable for grinding Hard alloy, Optical glass, vitrify, gem, agate, honing cylinder sleeve ... carbideGCgreenOnly no harder than Boron carbideSuitable for grinding Hard alloy, Optical glass, vitrify and other hard friable materials ...