About this item NATURAL MATERIAL: Made of red corundum and green silicon carbide, high hardness and good thermal conductivity.DOUBLE SIDED GRINDING STONE DESIGN: The 400 grit side can be used for coarse grinding to form an edge or to repair damaged blades. The 1500 grit side can be used to remove burrs on the edge of a knife.EXCELLENT SHARPENING PERFORMANCE: Excellent sharpening performance. Super fine sharpening stone, perfect for grinding and polishing knives.EASY TO USE: This knife sharpener can be used with cheap water sharpening lapping oils, you can clean it with water easily.MULTIFUNCTIONAL TOOLS: This knife sharpener can Pointed blade there, such as kitchen knives, hunting knife sharpener, scissor sharpener, scissor sharpener, blade sharpener, razor and so on.Instructions:1. Soak the stone in water about 15 minutes before using, salt water is best.2. Sharpen the knife in the order of first rough then precise.3. When sharpening the knife, hold the knife handle with the right hand, the fingers of the left hand are lightly resting on the edge of the knife, move in the direction clockwise.4. The sharpening angle is better 10-20 degrees.5. Do not scrape the mud when grinding, the knife can be ground harder with mudSpecifications:Material: Red Corundum + Green Silicon CarbideGrain Type: 400 Grit 0026 amp; 1500 grainsSize: Approx. 100 x 35 x 22mm / 3.94 x 1.38 x 0.87 inchColor: 400 Grit: Rust, 1500 Grit: MintPackage includes:1 x sharpening stoneNote:Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.