Bought some anti-theft ones a couple of months ago (the ones held on with tiny Allen bolt), GOT NICKED after a couple of weeks by some young scallywag!! Rocking with plastic now. 
Anti-theft-valve-caps.... Im goin to start selling packets of air on eBay if anyone wants to buy some?? *rolleyes*
even the spinning types are worthless now cos you can get the spare keys for them at halfrauds
