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+1 to Jimmy,Holli, and Avatar, and just to add to the confusion... even when you are talking about coticules and BBW's or other naturals, you must approach them on a stone by stone basis. While they...

They don't actually have grit ratings, just rough approximations. The 12k isn't REALLY a 12 k in other words. The differences come in the hardness of the stones, the speed of cutting, and the finish...