Two-stage knife sharpener quickly sharpens all western and American style knives using 100% micron-sized diamonds, including both straight and serrated blades. produces a strong and highly durable double bevel edge in under two minutes precision angle control guides make sharpening easy and knife edge consistent two-stage process restores and sharpens the edge first with fine diamonds then hones and polishes it with ultra fine diamonds in the second stage knife edge will be razor sharp and stay sharper longer than conventional or hollow ground edges Engineered and assembled in the USA.