Chef's Choice 4643 ProntoPro Diamond Hone Manual Knife Sharpener. Manual sharpener can sharpen Asian, European or American knives and can create 15 degree edges as well as 20 degree edges. Sharpens 100% diamond abrasive wheels with Chef's Choice's CrissCross technology. Has precise angle guides and a separate honing stage for supremely sharp knives. Can be used on straight edge household and kitchen knives, santoku knives, sports and pocket knives and serrated blades.