Recommended by Cook's Illustrated, a leading consumer and kitchen testing publication, the Chef'sChoice Pronto Manual Diamond Hone Sharpener Model 463 is affordable, easy to use, quiet and extremely fast. It will put a flawless, extremely sharp, better-than-factory 15-degree edge on 15-degree class knives, including Santoku and other Asian-style double-sided knives. This fast manual sharpener helps prolong the life of quality knives because it creates a super sharp 15-degree double-bevel arch-shaped edge that resists dulling longer than conventionally sharpened hollow-ground or V-shaped edges. The edge it applies is razor-sharp and long-lasting, with a bite that slices smoothly through fibrous and non-fibrous foods. Using the Chef'sChoice perfected CrissCross technology, this 2-Stage sharpener develops an extremely sharp double-bevel edge with microscopic teeth along the entire cutting edge. These tiny teeth provide the bite on the edge and work to engage the food for effortless cutting instantly. Keep this sharpener on hand and enjoy the satisfaction of using sharp knives every day. Covered by the Chef'sChoice One-Year Limited Warranty.