Foss says about the Duo Diamant Sharpening Stone 7514
Foss Duo Diamond stone offers the ultimate in sharpening your speed skate blades. The stone features multiple layers of the
hardest micron-sized diamonds. The diamonds are bonded in nickel and attached to a flat metal surface.
The overlapping hole design of the diamond stone collects and holds the metal fillings during the sharpening process. These
features will enables you to sharpen the highest quality speed blades quickly and easily.