High torque pneumatic engine structure accurate device can achieve the work efficiency. No heat, high efficiency drive,high speed bearing with long service life. The advantages of small volume, feel is good, low vibration, low noise, and the advantages of speed and torque. Linear reciprocating, circumference of oscillating pneumatic ultrasonic grinding machine is used pneumatic engine structure technology. 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., Manufacturer: MNMIOIO