Knife sharpener. Size: 20x4. 5x7. 5 cm. Material: plastic, steel, silicone, sharpening elements: carbide, ceramics, and diamond deposition. Three stages of sharpening. The angle of sharpening on one side is 17°. Suitable for sharpening metal and ceramic knives. It is recommended to clean the surface with a soft, damp cloth. User manual inside the package.