No, that's not it Trena.

is it anything to do with the chain part around the middle of the wheel on a bike Graham?

er - a "router" of some kind??

Sorry to be slow responding. But no, not a router or router bit.

Feel I should know this but can't bring it to mind. Time for a clue maybe?

It's in a woodworker's workshop and is a set.

Hmm - I have a set of hole saws that might look like that with the right lens.

Spot on Peter, a set of hole saws allowed to crowd into each other. Well done.

ah, well done Peter, I would never have got that,been a long time since I did any woodwork,I have forgotten all my tools!!!!

Thanks folks - it took a long time-------------. Now I'll try to come up with something but in the meantime if anyone has anything please feel free.