Chef's Choice 210000 210 Hybrid Diamond Hone 2 Stage Knife Sharpener, White and Black New advanced Hybrid technology combines an electric and manual sharpener for creating razor sharp edges 2 stages; Electric stage is for sharpening, manual stage is for honing; Can be used on straight or serrated knives 100-Percent diamond abrasive wheels are used in both stage 1 and stage 2. The new and efficient "Criss -Cross" technology creates an extremely sharp edge with lots of bite Diamond abrasive wheels sharpen simultaneously creating a superior, burr-free edge quickly and easily; Its fast and extremely easy to use Safe for all quality knives; One year warranty; Assembled in USA