Contours to Your Blade’s ShapeFixed edge sharpeners grind-down and destroy your knives. What if your knife sharpener could contour to your blades edge and eliminate the need to purchase specialty sharpeners? Knife Sharpner replaces your Japanese sharpening stone, water sharpening, stone, and knife sharpening block. Thanks to the two independent spring-action arms made from ultra-hard tungsten carbide,Edge flexes and contours to any blade or angle.