SMD Hollow rotary gearbox operates on input gear, Outer ring gear and Intermediate gear. With help of motor the input gear rotates and it supplies rotational power to intermediate gear which rotates the outer gear ring. Cross roller bearing is mounted on outer gear ring. Which gives accurate balance and motion to mounted application. For More Information Visit us -https://www.smdgearbox.com/ Ph No - +886(09)67388376 / +91-7030669818