Stone tool or just a stone?

[eppingera]

Hi all, I liked seeing all of your hammer stones and other tools. Does this look like a tool? The one end has a very shallow groove all the way around and both ends are blunt. It is a pretty banded stone, probably natural but I thought I would ask just in case. Thanks!

 

[quito]

Looks natural to me

 

[The Grim Reaper]

Natural. The "groove" you see is created by a softer stone eroding out faster than the other stone.

 

[eppingera]

I thought maybe that was the case, thanks guys!