The 900-F series consists of a single grit of 900 grit. This is a unique finishing stone, which, despite its low value of its grit, works much thinner than the finishing stones in 1200 grit of many other series. At the same time, it has a sufficiently high abrasive ability and can remove visible scratches. All this is due to special active additives in the composition of the bond, a very narrow sieving of abrasive grains and an open structure of the stone. Although the 900-F series is unimpregnated, it can be used with both oil and water soluble cutting oils.
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