The advantages of small volume, feel is good, low vibration, low noise, and the advantages of speed and torque. Ergonomic handlebar are designed to make the operation more comfortable. High torque pneumatic engine structure accurate device, no heat, high efficiency drive. It can use different jig for grinding operation, can clamping file or the grinding tools, such as the grooves in the or hardware products, R Angle and other manual processing. application for polishing, processing, Die casting to remove material overflow, remove burrs.