<center><img src="http://pictureposter.audiworld.com/48483/lug_nuts.jpg"></center><p>

This is the Audi set, which has several "keys". I believe the male/female ends are reversed.

<img src="http://www.clairparts.com/RetrieveImage.asp?product_id=1209">

You'll probably need something like this to get it off:<ul><li><a href="http://buy1.snapon.com/catalog/item.asp?item_ID=73423&amp;group_ID=1652">http://buy1.snapon.com/catalog/item.asp?item_ID=73423&amp;group_ID=1652</a</li></ul>

that was a close fit on them or weld another nut to them to get them off.