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The Tormek grindstone differs from a standard grinding wheel in more than one way. The unique composition of this stone, together with the Stone Grader SP-650 gives you two different cutting actions in one grindstone. The Stone grader polishes the surface of the grindstone from its normal 220 grit to a finish that works like a 1000 grit stone. This is a great advantage since you can do the fine sharpening* with the same setting of the jig as used for the initial shaping* of the tool.