The #320 Shapton Pro Stone is 15 mm of abrasive. A professional grade ceramic whetstone for any knife. The Shapton Blue-Back #320 stone is formulated to remove high-carbon steel with a much cleaner scratch pattern. This stone is a very good intermediate step before moving to the #1000. The #320 retains its shape very well. A good guide in using this stone is the Jende Book of Sharpening.
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