Ring gears and pinions are the backbone of every power transmission system that transmits rotational motion securely from one shaft to another. It primarily uses for change the speed as well as the torque of rotating shaft which provides desired speed and good control over a wide range of applications. Heavily engineered, the ring gear and the pinion function by teeth locking within one another to provide a smooth and effective transfer of power. The ring gear usually surrounds this pinion gear (which has the internal teeth), and is generally a circular gear itself with openings for access to the easy-to-replace external teeth. Some of the features include great strength & durability, support heavy loads and compact design that helps in saving space. Automotive drivetrains, industrial machinery and everywhere rotational speed or torque needs to change.