Diamond-abrasive wheels produce an ultra-sharp, burr-free edge on European, American and Asian-style knives. Fastest manual knife sharpener with precise bevel-angle control and 3-stage sharpening creates ultra-sharp 15 degree and 20 degree edges on knives. This multifunctional Chef'sChoice knife sharpener precisely sharpens straight-edge and serrated knives, including sport knives. With 100% diamond abrasives and Criss-Cross sharpening technology, diamond abrasive wheels sharpen simultaneously "into" and "out of" the knife edges of European, American and Asian-style knives. Micron-size diamond abrasives in Stage 3 create the super-sharp edge, polishing to a burr-free finish for a stronger bite. These diamond-coated abrasive pads hold their shape indefinitely and sharpen any alloy. Will not load up, so oil or water is not needed. Soft-touch handle and nonslip base ensure a secure, steadfast grip. Exceptionally safe to use and easy to store, this manual knife sharpener fits in a kitchen drawer. Engineered and assembled in the USA. 1-year limited manufacturer warranty.