The 3-phase diamond sharpening technology of the Chef's Choice 130 offers a unique variety: depending on the type of knife, a specific edge can be created. The device ensures a fast and ultra-sharp result, making it suitable for semi-professional use. Diamond is the hardest of all gemstones, which is why all Chef's Choice knife sharpeners use diamond-coated sharpening wheels or grinding bodies. This allows knives to be sharpened gently, quickly, and precisely. The edge is rebuilt quickly and ultra-sharply with minimal material removal, and overheating, along with the associated softening of the material, is excluded. This innovative sharpening technology guarantees that you will enjoy your high-quality knives for a long time. The 3-stage angle sharpening technique includes "pre-sharpening," "sharpening," "honing," and "polishing," and is suitable for all smooth and serrated household, leisure, and commercial knives. Safe and risk-free for all knife qualities with minimal material removal.