Knife Sharpener, Mmanuel Knife Sharpener, 4 in 1 3 Tier Knife Sharpener with Angle Adjustment, Coarse Grinding, Fine Grinding, Precision Sharpening, Auxiliary Grinding Scissors, For Many Kinds Of Kitchen Knives offer 100% service: If you have any questions or problems with the purchase, please do not hesitate to contact us. We will solve the problem for you immediately and offer our best service to make sure you are satisfied . Tips for use: 1. Do not pull back and forth when grinding and sharpening. Use only one direction. 2. Do not put the knife sharpener in the dishwasher or in water. Clean the slots with a soft brush. 3. Clean the knife before sharpening. Do not use water or other liquids when sharpening. 4. Keep the knife grinder away from children to avoid accidents. 5. Sharpening scissors; angle adjustment knob. Coarse knife sharpening; Fillet knives = 14~16°. Sharpening rough knives; Kitchen knives (American/Euro) = 18~20°, pocket knives=18~20°. Fine sharpening of knives;