Three grit surfaces in the palm of your hand to add a razor-sharp edge to every knife. This diamond knife sharpener features coarse, medium and fine surfaces to sharpen virtually every style of stainless-steel knife blade, providing a flawless, gap-free long-lasting edge. Each grit is curved to follow the specific blade design. Use the coarse grit for dull surfaces, medium to sharpen and fine to finish the edge. Lightweight, balanced and easy to use with a lens-shaped steel shaft for easier maneuverability and precise sharpening. Will not wear out. Dishwasher-safe. Made in the USA. Lifetime manufacturer warranty.