Keep your knives sharp and ready for optimum performance with the Chef"s Choice hybrid knife sharpener. It has precise knife guides that automatically position the knife to sharpen the edges of both straight and serrated knives. This 3-stage knife sharpener uses diamond abrasives to create an extremely sharp edge on even the dullest knives. You can use stages 1 and 2 for electric sharpening and stage 3 for manual sharpening and polishing.