Wusthof Ceramic Sharpening Steel: The hard ceramic rod of this Wusthof ceramic sharpener has been specially formulated for the easy restoration of your knife's cutting edge. This knife sharpening steel has the feel of a quality product with hanging hook detailing. The 26cm length means its ideal for sharpening your longer knives such as carving and chefs knives as well as the utility and boning knives. Used to restore knife blade edges. European grade: 360, Japanese grade: 800.