The Chef's Choice manual sharpener is ideal for a wide collection of knives that need sharpening at home. The precise guides provide an easy to use 15 degree angle for specialist Asian style knives and a 20 degree angled guide for other European and American knives for superior sharpening. The 100 diamond abrasive wheels use a criss-cross sharpening technology for a burr-free edge. The manual Chef's Choice sharpener can also be used for serrated knives. This is the fastest manual sharpener available for European, American and Asian style knives. It features a three stage sharpener for super sharp edges. New CrissCross sharpening technology makes an extremely sharp edge with lots of 'bite'. Diamond abrasive wheels for a burr-free edge. Steel construction. 1 year guarantee.