The Milwaukee 14-29-0450 Gear Box & Case Assembly helps transfer and protect mechanical power within compatible Milwaukee power tools. The gearbox houses the internal gears and supports their rotation, while the case helps keep the components properly positioned during operation. A properly functioning assembly can support smooth power transmission and reliable tool performance. Repla... https://www.wholetoolbox.com/milwaukee-14-29-0450-gear-box-case-assembly/14-29-0450.html