Chef's Choice knife sharpener produces razor sharp edges with advanced Hybrid technology, combining 2 stages of sharpening, electric, and manual. Uses 100% diamond abrasives in both stage 1 for electric sharpening and stage 2, for manual honing and resharpening. New, efficient, criss-cross sharpening technology for extremely sharp edge with lots of bite. For use with straight edge and serrated knives, kitchen, sport, and pocket knives. 1 year limited warranty. White.