Many US cars would not have it, countries that demanded mechanical emergency roll-down tools came with them.
Them being that plastic piece and the long metal thin piece that is slid through the spark plug tool.
They are for rolling down a electric window in an emergency, localized versions that had this have a small popout in the door panel cards that allow this tool to go through and roll down a window with a broken motor, etc.
We have little need for it, other than it "completing" the kit.
