The small sharpening stone from Opinel is a gadget that should not be missing in any kitchen. Opinel has turned the honing stone made from shell sandstone into the ideal kitchen tool for sharpening. Thanks to its grit, the blade achieves a very sharp edge in no time. The sharpening stone, consisting of a quartz-carbonate grit of 800-1000, lives up to its reputation as one of the best sharpening stones for knives, scissors, axes, and more.