to keep knives sharp, easy to use, perfect for the inexperienced, 3 sharpening tools, tungsten carbide diamond ceramic, 0 ? blunt ? tungsten carbide, 1 ? rough ? diamond-coated grinding wheel, 2 ? fine ? Ceramic, interchangeable grinding head, preset angle 20-40°, ergonomic handle, suitable for right-handed and left-handed users, stable stand thanks to non-slip underside