Furi FUR836 Rachael Ray Ozitech Diamond Sharpener. Ozitech uses 8 Diamond Fingers to sharpen and hone faster and easier than traditional steel or stone methods. The diamond coating will regrind the cutting edge to perfect 20 degree bevels. It is perfect for most knives used by chefs, home cooks, or for sporting/outdoor knives. Not for use with serrated blades, scissors, forged bread knives, or chisel-edge sashimi knives.