That is a really neat find! I have no clue what that might be other than maybe a fish net weight?? It will be interesting to see what others here have to say. Good luck!
I think its natural because of a few reasons ..but would still like to hear the context you found it in.
Welcome to the Forum.
I think it is a fossil of sorts.
The leftovers from an ancient tube worm in ocean sediment a very long time ago.
It shows zero evidence of being used as a hammer..there has been no grinding anywhere to create an axe bit and the whole shows no evidence of being drilled.