First function: can be as the valve cap, remove threaded debris and waste.

The second function: you can put the screw into the tyre valve, especially cars, motorcycle above! So at the time of installation of tyre, inner tube wouldn't fall in,and It is easy to be pulled out!

 Third function: As the valve  wrench, can tear open tyre valve, tire repair often use it!

Fourth function: can use threaded point to pull iron thorn etc out from tyre! with thread can spin into type to eject  the Iron thorn out.