Specifications: Material: Diamond Coating + Metal: Color: As pictures show: Size: 8.5cm: Package Included: 1 X Diamond Stone Dressing Tool Features: 1. Creates very little dust with no chips 2. Restores and extends the life of grinding wheels 3. Reshapes worn grinding wheels to give a true grinding surface 4. Robust diamond coated head with knurled handle for a secure grip 5. Covers the full width of the wheels to give a flatter surface 6. This diamond coated dresser is a simple way of returning your grinding wheel to its original condition. 7. To get the most out of your bench grinder, it is imperative that wheels are "dressed" regularly across their full width to maintain their balance and ensure a "true" grinding profile. Notice: 1. Please allow 1-3cm error due to manual measurement. Please make sure you do not mind before you bid. 2. The color may be different as shown in the picture, please understand. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.