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To test the sharpening stone
The estimated grit for Bethesda Black is 2000 JIS
Easy identification due to laser engraving
📐Convex Attachment 7
Integral sensors
tsushima natural nagura To test the sharpening stoneTsushima Natural Nagura stones are used to create a honing paste on the surface of natural stones in order to refine the grit structure and give the stone a better bite on the edge being sharpened. Tsushima Nagura stones are usable on all sharpening stones from medium to ultra fine grits. They work on artificial stones as well as they do on natural stones. Tsushima Nagura () is mined on Tsushima Island off the coast of Nagasaki Prefecture in Japan.