The Classic Knife Sharpener makes professional-quality sharpening foolproof. Safely sharpens all types of knives, including serrated, specialty and high-quality Damascus knives. Features precision-ground ultra-hard tungsten carbide sharpening surfaces on patented spring-action bars. Performs three different sharpening techniques – coarse sharpening (used only for very dull or nicked knives), honing, and polishing. Invented and engineered in Austria by master knife maker Harald Stallegger.