SP-650 Stone grader
Tormek stone grader
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.