Whether you're slicing meat, dicing vegetables, or carving the Sunday Roast, a sharp blade makes cutting effortless. Works with all your knives - even serrated blades Works with all your knives, even serrated blades(Not suitable for extremely fine-toothed serrated knives) Very safe one handed use, Power Grip suction attaches securely to any flat surface. High-temperature treated high-quality tungsten steel ensures sharp sharpening. Needs only gentle pressure. Safer, hands free use. Power Grip suction cup attaches securely to any smooth, flat surface. The best Angle for high quality steel knives is 20 degrees. Itprovides the perfect edge every time. Gettingan Angle consistent with the sharpener is a skilled job. Widely used in kitchen knives, kitchen knives, fruit knives, chef's knives and more. Notsuitable for extremely fine serrated knives. How to Use 1.First find a clean blade to suck the sucker. 2.Put it on the table suction cup without air, and then press the handle hard. 3.After a few turns, you can easily get a sharp knife. 4.Remember that any sharp knives do not need too much pressure and should be cleaned before use.