Eddington's 3-Way Knife Sharpener If you're struggling to slice through those onions, or even failing to chop up a few mushrooms, it's time to give your blunt blades a new edge. With this 3-way sharpener that couldn't be simpler, or safer. All you need to do is draw your blades through one (or all) of the three channels. The first, made with tungsten steel, gives the knife a new edge. The second, diamond-coated sharpener smoothens out nicks and dents. The last, made with ceramic, refines the edge for optimum sharpness. Meanwhile a suction pad at the bottom of the sharpener grips to the worktop firmly, allowing you to draw blades through the channels without having to hold it in place. It's the safest way to sharpen knifes.