The Tormek Grindstone is constructed so that with the Stone Grader it can be treated to change its property from fast grinding to fine grinding, i.e. sharpening. This has obvious advantages. You can make both the first fast grinding and the sharpening on the same grindstone and the same grinding machine and with the same setting of the jig. Besides being a very fast method, you achieve a perfect edge as the fine grinding is done in exactly the same position as the first fast grinding. The grading of the grindstone is made by pressing the fine side of the Stone Grader onto the grindstone, which makes it work as a fine grit stone (approx. 1000 grit). When pressing the coarse side onto the grindstone, the smoothened surface is returned to its normal condition (220 grit). This process does not place excessive wear on the grindstone and can be repeated any number of times.