Factory-sharp edge for Asian style steel knives. Thin, razor sharp edges for effortless food preparation. For single or double faceted blades. Create the Asian edge on thin European / American style blades. Two stage sharpening for stronger edges and faster results. Other features include: Honing - Fine 100% diamond abrasive, polishing - Ultrafine 100% diamond abrasive, precision guides sharpen at 15 degrees, resharpen with ultrafine diamonds - knives last longer.