Combining electric and manual sharpening, the Chef’s Choice Hybrid Model 250 is ideal for all quality 20 degree class knives including fine edge and serrated, kitchen and household as well as sports and pocket knives. It creates a triple-bevel edge using three successive stages. The first and second stages are electric and use 100% diamond abrasives for shaping and sharpening the first two edge bevels. Stage 3 hones and polishes the third bevel using ultra fine diamonds for a razor sharp, arch-shaped, professional edge that is stronger and more durable than conventional V-shaped or hollow ground edges. Since it is the manual stage, Stage 3 can be used anytime, and anywhere without power! Stage 3 also sharpens serrated edges. One year limited warranty. Engineered and assembled in the U.S.A.