MinoSharp Plus Black/Red. If ease of use is your primary consideration, MinoSharp Plus is the correct sharpening tool for you. It is suitable for all brands of knives. However, It cannot be used for serrated knives or knives sharpened on one side like the Bunmei knives. The larger wheels of the MinoSharp Plus put a larger edge on your knives giving them a longer lasting edge. The large wheels make the MinoSharp Plus the most effective sharpening gadget, manual or electric, on the market. The MinoSharp Plus is more appropriate for thicker, heavier European and American brands of knives.