Three-stage grinding process (coarse, medium and fine) you get exceptional sharpness for each knife depending on the degree of wear.The first slot is scissors.Grooves 2, 3, 4 are used for rough grinding, finish grinding and polishing.It is a fine cutting edge that can make every blade from dull to sharp. The materials used for the manual sharpener are: tungsten carbon steel, ceramic stone, diamond rod.The body of the light sharpener is made of lightweight and sturdy ABS plastic.The handle is comfortable and wide, so it can be easily stabilized and held in place. The non-slip rubber on the bottom base of the sharpener ensures maximum stability and safety against slipping of the sharpener.Quickly and easily grind most steel and ceramic knives for use on flat, dry surfaces in kitchens, wood, stone or glass countertops. With a safe and ergonomic design, the sharpening tool gives you a sturdy handle to keep the equipment stable and ensure the safety of the sharpening process. Suitable for: straight-edged steel kitchen knives and wide sawtooth knives (bread knives), including knives with hardened steel blade.Do not use with: ceramic knives, scissors or serrated micro knives.