This is the only electric sharpener I know of where you can change out a sharpening stone set to switch from 20-degree-bevel knives (western knives) and 15-degree-bevel knives (asian knives) . The sharpener isn't cheap, but it seems to work really well and it saves having to chase down a sharpening service (who probably uses the same equipment) every time I need to touch up my kitchen knives.