Stronghold hitch hock alko sold secure note the black and grey handle on the image is part of a caravan and is used for illustration purposes only hitch lock for use on al ko ak130 ak160 aks1300 aks2004 aks3004 and aks3504 couplings including the new 2012 range sold secure tested and approved at caravan gold standard easy to fit hitched or unhitched and a high visibility deterrent comes with a handy storage case and plastic ball for extra security for fitting unhitched