An absolute exception: Achieving a grain size of 10,000 with synthetic stones really is something out of the ordinary. The sharpening has to be preceded by three grain sizes, e.g. 2000, 4000 and 8000. Only then can you use the absolute jewel, the 10,000 tool, which results in a virtually scratch-free, high-gloss polish for extreme sharpness. For the highest standards of sharpness and surface finish – cuts through the material almost without sound.