Combination Stones

One coarse side to pre-grind blunt tools, the other side is fine to sharpen the blade. White corundum for low and mediun alloyed steels when high surface quality and low material abrasion is required. Silicon carbide green, for hardened steels, non ferrous metals, carbide, glass and aluminium alloys. To re-shapen very sharp cutting edges and carbide-tipped tools.

89A - white corundum

C - silicon carbide