whats this key for?

[reido80]

Hi all,
Just wondering if anyone knows what this key is for.
I got it with my 2003 a4 1.9 tdi quattro. Its not the same cut as the other ingnition key ect? towbar or roof rack maybe???

http://i3.photobucket.com/albums/y93/reido80/DSC01710.jpg