The supplied Gear Boxes are a contained gear train, or a mechanical unit or component consisting of a series of integrated gears within a housing. In fact, the name itself defines what it is a box containing gears. It is used to increase or reduce speed. As a result, torque output will be the inverse of the speed function. It is a mechanical method of transferring energy from one device to another and is used to increase torque while reducing speed. Torque is the power generated through the bending or twisting of a solid material. This term is often used interchangeably with transmission. The offered Gear Boxes are very efficient and made for commercial uses. They are very durable.