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Product Material: Natural Pulp Stone Product Nature: Fine Grinding Product Size: 180*60*30 mm,The 6000-grit Natural Whetstone Produces Pulp Quickly Without Hurting the Blade. Product Use: Suitable for Pedicure Knives, Household Kitchen Knives, Scissors, etc. Sharpening Steps 1. Soak the Whetstone in Water for 15 Minutes First, and It is Better to Add Some Salt into Water; 2. Sharpen the Knife in the Order of First Thick and then Fine; 3. the Best Sharpening Angle is 10-20°; 4. Don't Scrape off the Mud After Sharpening the Knife, There is Water to Sharpen the Knife; Note: Household Kitchen Knives Are Generally Recommended to Be Finely Ground Once a Week and Wipe Clean After Use, and then Dry in a Cool Place. Perspective Knowledge 17 Degrees: It is the Angle of General Shaver or Sushi Knife, Chef's Knife, and Kitchen Knife. the Blade is Sharp and Has Poor Durability. 20 Degrees: Can Provide a Very Sharp Knife Surface, Portable Knives May Need Very Sharp Knives to Use. 25 Degrees: a Sharp and Continuous Opening Angle. Generally, Knives Used in the Field Are Usually at This Angle. 30 Degrees: It is Not Easy to Become Dull when Used with Bayonet or Field Knife, and It is Easy to Grind. 40 Degrees: Survival Knife (20 Degrees on One Side) 40~50 Degrees: Cut General Wood (20~25 Degrees Per Side) 50~60 Degrees: Cut Very Hard Wood and Chop Bones (25-30 Degrees Per Side) 60 Degrees and Above: Cut Iron (one Side is 30 Degrees and Above)