The Milwaukee 4931465516 is a genuine replacement gear box for the compatible M18 FUEL ONE-KEY 18V 3/4" high-torque impact wrench. It forms part of the tool's transmission assembly and is designed to replace the original gearbox. This part has been discontinued by Milwaukee and is no longer available.
Milwaukee 4000467205 M18ONEFHIWF34-0X M18 FUEL ONE-KEY 18V 3/4" High-Torque Impact Wrench