With the Longzon four-stage knife sharpener, you can sharpen blunt knives easily and professionally. The three-step sharpening process – coarse, medium, and fine – keeps your kitchen knives brilliantly sharp. The bottom of the knife sharpener has a non-slip rubber base that prevents slipping during use. Simply place the blade in the sharpening notch, hold the handle, and gently pull the knife through a few times. After a few seconds you will restore your blunt knives to their original sharpness.