Japanese Nagura Stone.
For use with the finer Japanese waterstones, this Traditional 'Nagura stone' can be used to create a slurry on the surface that aids the sharpening process, to create a razor edge.
Submerge the stone (as with the waterstones) before use and then move over the surface of the waterstone in a circular motion to create the slurry, then sharpen as normal.
Made in Japan
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