You need to match your stone finish to your steel you are going to use so if you have a coarse steel generally you use a course stone. Most get a nice sharp knife and wreck it buy using a too coarse of a steel and rip the edge off or steeling at different angles to what they have sharpened at and fold them over. Unless you are hollow grinding or have a very thin knife the really fine stones wont do much for you apart from take longer to sharpen especially on high carbon steel. Just my 2 cents worth
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