The Milwaukee 14-29-9001 Gearbox Assembly transfers rotational power within compatible equipment for proper operation. It contains gears that work together to transmit motion from the motor or drive component to the working mechanism while adjusting speed and torque as required. Proper gear engagement maintains controlled movement of connected parts during use. A functioning gearbox s... https://www.wholetoolbox.com/milwaukee-14-29-9001-gearbox-assembly/14-29-9001.html