Proper care and maintenance of your Shun knife is key to ensuring consistent slicing and cutting performance every time. This Shun Classic 9 inch combination honing steel is the easy and quick way to keep knives sharp. It offers two honing surfaces: a smooth one for day-to-day honing, and a micro-ribbed one for weekly honing. When you're preparing food, knives are continually in contact with cutting boards or other surfaces. This eventually dulls the sharpness of a knife. A Shun honing steel is the easy and quick way to keep your knives in perfect working order. When you run your knife against a steel, it realigns the knife edge and preserves its sharpness.