Just bought one of these as a nice addition to my toolkit as I change wheels around quite a lot on my Murena.
See link below.
GP
http://www.ebay.co.uk/itm/230670358405?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Yes, a useful piece of kit, my Citroen C5 came with one in the toolkit. Cheapskates can make their own from a bit of M12 threaded rod or by cutting the head off an M12 bolt ;)
Handy. Most recent Alfas come with one as standard but, although they are M12, they are not the same thread pitch.
I've just changed mine to studs and nuts
good little idea, i've changed my car back from momos to the std wheels and they are so much more dificult to fit.. not that I can put my finger on why.. This is a worthy investment!