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The Tormek Japanese Waterstone is 4000 grit and delivers a mirror finish with hardly any visible marks.
Alan Holtham, English woodturner and journalist, tries the Tormek Japanese Waterstone SJ-250 for ultra-sharp edges (also available for T-4 and 1200 models as SJ-200) and the Tormek Blackstone Silicon SB-250 for faster cutting action on HSS and exotic alloys.
This is the smaller version of the Tormek Japanese Waterstone, which has the same composition and qualities as the SJ-250.
Read more about the stone's features at the product page for SJ-250 Tormek Japanese Waterstone.
SJ-200 fits Tormek T-4 and previous Tormek models with a 200 mm stone diameter.