This came to me in a box of bits so I guess it could be from anything
I am sure it's from a bike though. The bolt head has a 6 or a 9 on it depending on how you look at it.
Thanks for your input. I think I might just put it back in the 'probably don't need these bits but I will keep them just in case' box.
Actually the best thing to do would be to chuck it out as I am sure that two to three weeks after I would find that I needed it for something