The Wusthof 2-stage Hand-Held Knife Sharpener is safe and easy to use. Place the sharpener on a flat work surface and hold the E-Z grip handle with one hand and the knife handle with the other. Insert the knife blade fully into the slot at a 90-degree angle to the sharpener and pull back a few times to sharpen. After setting the knife’s edge with the carbide side, use the unit’s ceramic side to nicely finish the edge. For use with left or right-handed users, the blades will sharpen in exactly the same way regardless of which side of the unit the blades are pulled through. For serrated or scalloped blade edges, use the ceramic (Fine) stage only. Turn the sharpener upside down and shake out shavings if needed.