Powerful: This grinder is equipped with a high-quality 370W motor for smooth and fast operations. It is also equipped with 2 pieces of metallographic sandpaper, which can be used for pre-grinding, grinding and polishing of metallographic samples. Double disc: This polishing machine contains a polishing disc (diameter: 203mm, rotation speed: 600rpm) and a grinding disc (diameter: 230mm, rotation speed: 450rpm). Sandpaper and flannel (not included) can be fixed on both the grinding and polishing discs to meet your various needs. High-Quality Material: Made of high-quality ABS, not easy to deform and age. The body is designed with heat dissipation holes to ensure timely and effective heat dissipation, allowing you to use it with confidence Water-cooling faucet: This machine is equipped with a water-cooling faucet, which can take away the heat generated during the grinding and polishing process and avoid damage to the metallographic structure of the sample. Wide range of uses: This metallographic grinding and polishing machine can be used for polishing and grinding samples, and can also be used to observe and measure the metallographic structure of samples under a microscope. It is a good tool for the laboratory