The **TSPROF Boride CS-HD six-piece sharpening stone set** contains six sharpening stones made from silicon carbide on aluminium plates. Silicon carbide is a seriously hard sharpening material that can effortlessly sharpen knives with a hardness up to 63 HRC. Even the hardest Japanese kitchen knives are no match for these sharpening stones. Compared to aluminium oxide, silicon carbide has sharper and thinner particles. This results in less wide scratches and a nice silky shine on the edge of your knife when using higher grit sizes. These narrow versions are more suitable for sharpening small knives and knives with a recurve or with a curved blade.
The stones are made in the United States by Boride, a world-famous manufacturer of abrasives. The stones are mounted on an aluminium plate so they can be easily attached to the TSPROF sharpening system. You can use the sharpening stones dry or with [sharpening oil].
## Boride sharpening stone grit size
**This sharpening stone set includes:**
* 1 x 120 grit extra coarse Boride CS-HD sharpening stone
* 1 x 220 grit coarse Boride CS-HD sharpening stone
* 1 x 400 grit medium Boride CS-HD sharpening stone
* 1 x 600 grit fine Boride CS-HD sharpening stone
* 1 x 1000 grit extra fine Boride CS-HD sharpening stone
* 1 x 1200 grit ultra-fine Boride CS-HD sharpening stone
Boride determines the grit sizes of its sharpening stones based on the FEPA (Federation of European Producers of Abrasives) standard. For instance, the 1000 grit sharpening stone corresponds with a 2800 grit Japanese sharpening stone. This means the stones sharpen more finely than you might expect. Most sharpening stones use the JIS standard (Japanese Industrial Standard), simply because most sharpening stones are produced in Japan. To give you a better idea of the grit sizes, here is a comparison of FEPA with JIS:
* F120 grit (FEPA) = J130 (JIS)
* F220 grit (FEPA) = J230 (JIS)
* F400 grit (FEPA) = J700 (JIS)
* F600 grit (FEPA) = J1200 (JIS)
* F1000 grit (FEPA) = J2800 (JIS)
* F1200 grit (FEPA) = J4000 (JIS)
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