Features High quality diamond material, smooth surface. Metal back works great on magnetic plates. Superb craftsmanship, sharp, wear-resistant, strong and durable. High grinding performance, low noise. Fit for all concrete grinding machines. Description: Diamond Grinding Pad is a grinding tool for non-metallic materials such as stone and porcelain materials, which has high grinding performance, simple manufacturing, low cost, high grinding quality and can be applied to large-scale grinding processing.   Features: 1. High quality diamond material, smooth surface. 2. Metal back works great on  magnetic plates. 3. Superb craftsmanship, sharp, wear-resistant, strong and durable. 4. High grinding performance, low noise. 5. Fit for all concrete grinding machines.   Specifications: Material: diamond Grit Size: 30 Hardness: 10 Linear speed maximum: 35rpm Color: black Size(L*W): 5*5cm/1.97*1.97in Thickness: 6mm/0.24in Weight: Approx. 198g   Package Includes: 1 x Trapezoid Diamond Grinding Pad Note: 1. Due to the difference between the monitors and light effect, the picture may not reflect  the actual color of the item. 2. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. Package List