The Victorinox 41997 Mineral Oil is essential if you want your sharpening stones to perform at their best. The process of sharpening a knife creates frictional heat and over time this clogs the tiny pores that speckle your sharpening stone. To clean these pours, and help lessen frictional heat, applying water or an appropriate oil to a stone is necessary to aid the process and make sharpening your favorite blade smooth and trouble free. This one quart bottle is specially formulated to get the jo...