U.S.A. made fine grit Golden Stone polishes and professionally finishes using a variety of curves and angles. Holding the stone vertically on a tabletop, and tilting it from one side to the other, raises one edge off the table, creating a 20° angle (40° total angle) for sharpening knife blades. Elliptical sides have a large radius for sharpening PlainEdges, a smaller radius for SpyderEdges (serrations). Position it on its side (horizontally) to create a 12.5° angle designed for sharpening scissors. A groove down the length of the stone de-burrs and hones pointed objects. Suede carry case doubles as a non-skid counter top pad for tabletop sharpening. Cleaning: Wash in fresh water, scrub using a powdered abrasive cleaner and scouring pad. Rinse and dry. Dimensions: 7.5"x 1.5" x 3" USA