This is an installation tool for the new Mickey Thompson Metal Series 1/10 wheel caps. This tool can be used with a hex driver to install and remove the hub. Made from non-marking material to reduce the chances of scratching the center cap.
Shown with the Mickey Thompson Center Cap for example (not included) Z-S0850
You will need a standard 7mm hex driver to help you install the hubs with this tool. This will be the same size you use to install and remove the 4mm nuts.