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NSK Kogyo’s diamond sharpening stones are the result of years of development. They offer an exceptionally good sharpening feel — unlike many traditional diamond stones, which are often known for being unresponsive. Thanks to NSK Kogyo’s resin bond technology, these stones provide excellent tactile feedback and precise control during sharpening.

The stones are specifically designed for demanding knife sharpening tasks and are ideally suited for both professional and enthusiast use. They generate very little slurry, which makes it easier to monitor your progress. The grit size is always accurately defined and consistent.

 
Oboro Series
Designed especially for carbon steels, semi-stainless steels, and traditional Japanese steels (e.g. White #1, White #2, Blue Steel series).
Available grits: 200 / 400 / 800

 
Hakuto Series
Intended for all other steels — except carbon or semi-stainless steels.
Available grits: 200 / 400 / 800 / 1500 / 3000 / 6000 / 10000