Specifications: This grindstone is made of natural materials, well-polished and refined. Applicable range: domestic cutter, professional chef knife, outdoor knife, folding knife, chisel, collecting cutter, carving knife, sushi cutter, all kinds of super hard cutting tools. Wear-resisting, not easy to make scratches. Item Name: Grindstone Material: Adamas Quantity: 1Pc Type: 400/1000Grit Features: High Hardness, Rectangle, Durable, Knife Sharpener Size: 15cm x 6.3cm x 0.1cm/5.91" x 2.48" x 0.04" (Approx.) Notes: 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. Package Includes: 1 x Grindstone