... producing knife sharpening wheel 1.knife sharpening wheel be written according to the order, shape, size, abrasive material, grain, grade, , and speed ... carbideSuitable for grinding Hard alloy, Optical glass, vitrify and other hard friable materials.Black silicon carbideCblack Harder ... flexibility.Suitable for process weak Tensile strength metallic and Nonmetallic material, i.e. knife sharpening wheel