Three-stage kitchen sharpener Diamond sharpener is an excellent addition to your kitchen. Sharp knives make cooking easier and seamless. The three stages are for sharpening different gauges of knives depending on what you have in your home. It is extremely easy to use, just slot the blade in one of the spaces and move it up and down. Simply pass the knife blade a number of times through the Stage 1 coarse slot and the knife will be sharpened with ease. Touch it up by running it through the  Stage 3 Ceramic fine slot. The sharpening rods are made of durable tungsten and ceramic material ensuring that it serves you for many years. The main material used to make it is : ABS + stainless steel. The Grinding wheel material is made of tungsten steel + ceramic.