Knife sharpener with specifically designed sharpening holes and a 3/4-stage sharpening system, made of ceramic stone, tungsten carbide plates, and diamond rods Sharpener for Knives The sharpener is safe and non-slip, with an ergonomic handle and anti-skid base design. 2. Simply lay the kitchen knife sharpener on a level work surface and sharpen with one hand on the comfort-grip handle and the knife handle with the other. Then you can repurpose your old, dull stockpile and sharpen it again. 3. Pulling the knife in one way, quickly sharpen your dull knife. Throughout the sharpening process, the comfortable grip keeps your hand securely away from the moving blade.