Features:It is suitable for grinding kitchen knives and hard alloy. Coarse Medium and Fine 3 kinds of grits you can choose from. Made of high-quality diamond material really sturdy and durable to use. Small in size portable and convenient to sharpen more effectively. Stable performance attractive appearance and uniform hardness. Specification:Condition: 100% Brand New Item Type: Sharpening Stones Color: Red / Yellow / Blue Material: Diamond Package List:3 x Sharpening Stones Notice:1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. 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.