It is an authentic manufacturer approved replacement item that is specially produced for Milwaukee drills. This metal bearing helps to secure intermediate pinion gear while allowing it to spin freely with minimal friction. Over time this part may wear out and restrict movement, if this happens it can easily be replaced. Please note this high quality item is sold individually.
This chuck key tightens the jaws of the 3/8 inch capacity chuck 48-66-0795, and 48-66-0797. Key holder 48-66-4040 should be used to attach this chuck key to the cordset. This is a genuine Milwaukee part.