Product features：1. The inner and outer diameter spindles are carefully researched and designed, and heat treatment is adopted, with high rigidity and wear resistance. With precision bearing device, they can rotate stably and keep the spindle low temperature. 2. The motor base and spindle bracket adopt movable design, which is easy to operate. 3. The precision is about 0.005, and the workpiece is bright and accurate. 4. The machine is easy to install. Take down the original lathe tool rest, and install the machine for parallel locking. 5. The main shaft bracket of the grinder adopts cast iron three-point contact design, which is stable, durable and not deformed. 6. For example, steel, iron, copper, aluminum, cast iron, rubber, porcelain, marble and other workpieces after heat treatment are all used in this grinder, which can save high cost internal and external grinding machines.