if you take has a knife that was completely jaded, to get a new angle grinding, or when a blade or similar outbreak must be eliminated. Apparently there are people who in their distress or to such instruments of torture such as the Flex, Schleifhexe the workshop grinder, in which a just as the sparks fly around the ears, draw to raise "just" her knife, which usually leads to a barely irreparable damage. This stone of 80 grit, you have a helper for the tough, strong material removal that is, but under controlled conditions and on kommts on. I highly recommend him, I mean by hunting knife pre-sanded so that I now like a kitchen knife on a normal Wasserstein 1000 he grit sharpness and, if necessary, with even finer grits may depart, for example. to get sharp Skinnerklingen. There is no problem too thick, typically European blades so that a new flat grind to give the power of the subsequent use of fine stones Japan really fun.