The Pyrolux Three Step Pull Through Sharpener makes sharpening knives easy in 3 simple steps. The tungsten sharpening plates remove any small burrs nicks on the blade, creating a smooth overall surface for which to sharpen further. The diamond sharpener creates a finer edge preparing the surface for the final stage of sharpening. The ceramic sharpening plates create a razor-sharp edge by polishing the blade to a very fine point. 3-Stage: Tungsten-Diamond-Ceramic Sharpeners Create razor-sharp knives quickly easily Avoid the sharpener from getting wet Do not put the sharpener in the dishwasher Blister packed