The Fallkniven DC521 bench stone provides two grits to tackle most sharpening tasks in one stone.
The golden side is a fast and aggressive diamond stone, while the grey side is a slow, very fine ceramic stone. Both surfaces are precision flat, which is a prerequisite for perfect sharpening results.
The diamond stone works fast and should be used if the edge is blunt. The sharpness obtained is usually enough for everyday tasks.
The ceramic whetstone works much more slowly and gives a smoother, razor-sharp edge when necessary. For tools and chef knives, this bench stone is among the best available.