The Yaxell Hand-Held Water Stone Knife Sharpener is designed for all knives to put a sharp 12° edge on your knife blade. Simply remove the lid and pour water into the compartment and close the lid. Take your knife and insert the blade into one of the grooves at a 90° angle. Using moderate pressure, pull the knife towards you approximately 10 times. Repeat the same process using the other groove. After sharpening, hand-wash your knife in hot water and dry completely with a soft cloth, blade edge up.