Accusharp Knife Sharpener - The AccuSharp knife sharpener requires no oils or stones and in a matter of seconds and a few strokes sharpens knives, (even serrated knives), cleavers, axes, machetes, and many other cutting tools. The blades are made of Diamond Honed Tungsten Carbide. The AccuSharp knife sharpener has been recommended by top cooking magazines and users around the web.