Any Ideas?

[bayou6895]

Any Ideas?

 

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[Charlie P. (NY)]

Is it magnetic?

 

[nhbenz]

Exactly what I was about to ask!

 

[cudamark]

Maybe a valve stem cap?

 

[TheRingFinder]

I was going to say a quarter.

 

[bradyboy]

need more info
the issue to me is the last 2 images
can you tell us more, the last 2 images maybe the answer but we only have an image that's not very good
could be some sort of ball joint
is the dot / indent on the hex side look broken off?
Brady