4 different sharpening discs: There are 4 different diamond sharpening discs for the sharpener. They are 200/400/800/1500 , so you can e to sharpen according to different speed and smoothness. Diamond material: The diamond sharpening board is made of diamond, which is tougher, stronger, and more durable than a ring made of stone. The will not off easily when sharpening . Humanized design: One of the biggest features of this diamond sharpener is that no water is needed for sharpening . Compared with the sharpening stone, this sharpening board can work more efficiently. More and effective: This kind of sharpener can not only be used alone, more importantly, it can be used with a sharpener. In this way, the sharpening effect can be made more precise and efficient. Multi-purpose use: There is that this diamond sharpening board has a wide range of applications and can be widely used in cutting tools, such as tool grinding, scissors, chisels, planers, kitchen knives, etc. Colour:Silver Material:Diamond Size:About 16x 2.3x 0.9cm Package Contents: 4 * Whetstone Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.