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NSK Kogyo's diamond sharpening stones have been developed through extensive research. For years, the challenge with diamond sharpening stones has been their lack of feedback, making it practically impossible to know what is happening to the blade during sharpening. NSK Kogyo has achieved a bonding that provides the same feedback as in full-hard synthetic stones. The Kyokuha series is a good example of this.

The diamonds used by NSK Kogyo effectively cut and smooth out steel. The specified grit is always correct, and minimal slurry is produced during sharpening, making it easier to monitor progress.

Each sharpening stone from NSK Kogyo differs in hardness and softness according to its material. NSK Kogyo's diamond sharpening stones are ideal for all kitchen knives.