Push down the knives with a certain strength, pull from its base to the tip, don't push back and forth. After just a few seconds even old blunt knives are as good as new. The handle is ergonomically shaped with Rubber anti-slip base, for maximum grip and ensures ultimate stability and safety. Suitable for both left and right-handed users. The grinding position is made of tungsten steel, high-hardness ceramics and solid ABS plastic. Ensure long-term use.