The Chef'sChoice® Pronto® 463 applies an extremely sharp and durable edge on your 15 degree class knives, including Santoku and other Asian-style or contemporary Euro/American styles. It's affordable, easy to use, quiet and extremely fast. Using the Chef'sChoice® perfected CrissCross® technology, the 100% diamond abrasive wheels simultaneously sharpen into and out of the knife's edge on each side of the blade for a burr-free razor sharp edge. Stage 1 sharpens the edge and set the initial bevel using larger diamonds. Stage 2 completes the second bevel using micron-sized diamonds for an ultra sharp edge. Stage 2 can also be used to resharpen serrated knives.