Engineered to put a razor sharp edge on all quality knives! With this one sharpening system, you can sharpen both 20 degree and 15 degree class knives. This patented advanced technology electric sharpener can restore and recreate both, a 20 degree edge for traditional European and American style knives and a 15 degree edge for Asian style knives and contemporary European/American style knives. The Chef’sChoice 1520 will quickly and easily sharpen virtually all quality cutlery including American, European or Asian style household knives, fine edge or serrated blades, Santoku and traditional Japanese style single-bevel edges as well as sports knives and pocket knives. Approximately 1 minute for first time sharpening. Resharpening is approximately 10 seconds