Product Description: 100% Brand New.Easy sharpening and polishing all kinds of exact knives.For sharpening and polishing chilled steel,alloy steel and precision parts etc.The whetsone size is 150mm * 20mm * 5 mm,The base size is 157mm * 21mm * 4mm.As are natural stone, some stone has other color like black or white dot etc, please pay attentionColor: picture colorMaterial: oil stoneFeature: Eco-FriendlyType: SharpenersModel Number: Sharpeners9Name: GrindstoneFeatures: Anti-skid whetstoneGrit: 200 /400 /800 /1500 /3000 /6000 /8000 /10000 Chromium Corundum Whetstone (200 Grit)Green Carbon Whetstone (400 Grit)Boron Carbide Whetstone (800 Grit)Black Onyx Whetstone (1500 Grit)Ruby Whetstone (3000 Grit)White Agate Whetstone (6000 Grit)Natural Green Whetstone (8000 Grit)Natural White Whetstone (10000 Grit)Package Contents:8 * oil stoneOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.