A note on Grits
The term grit refers to the relative coarseness of the stone: The higher the number, finer the stone. There’s more than one standard for reporting the grit of various abrasives so it’s easy to get confused. These stones are made in Germany so the grit is reported using the FEPA (Fédération Européenne des Fabricants de Produits Abrasifs) standard, denoted by an F before the grit number. The Japanese Industrial Standard (JIS) is more commonly used for water stones since many of these are produced in Japan. That is why I have provided the equivalent JIS grit as well.