When that time comes that you need to touch up the sharp edge of your wusthof knife the 9-inch steel is a good option. The wusthof 9-inch-inch steel can realign your knife edge quickly and easily. Honing steels are often confused as sharpeners. Your honing steel will realaign your knife edge but will not put a new edge on it. A honing steel is a maintained tool that you use everyday. In the case of your knife this would be maintaining the knifes edge. To maintain a sharp knife you should steel your knife everyday.