Soufull Kitchen Tools Professional 3 Stage Diamond Coated Ceramic Rod-Non-Slip Base Sharpening Knife Easy to ControlHigh quality Material The grinder head is composed of ceramics, tungsten steel, diamond and the handle is made of stainless steel. This knives sharpener adopt the streamline ergonomic design, so its more convenience,safer and easier to use compared with the heavy grindstone and sharpening rod. 3 Step Sharpening System The fine diamond rod to sharpen daily sharpening and to repair and straighten damaged metal blades before the 2nd slot sharpens to