This is the fastest two-stage manual sharpener for Asian double bevel knives on the market today. In a minute, it puts a durable 15-degree, razor-sharp arch-shaped edge on straight and serrated Asian-style blades. Manual two-stage sharpener for santokus and other double-bevel Asian-style knives. Criss-Cross technology uses 100% diamond abrasive wheels that sharpen simultaneously into and out of the knife edge, for a burr-free edge with lots of bite. Compact size stores away in a drawer. Soft-touch handle for easy, secure grip. Assembled in USA.