SAS hitch lock can be used when hitched or unhitched to vehicle. Prevents car and caravan being separated in a car park or motorway services. Fits most AL-KO, Albe, and Harrison coupling heads. Covers coupling head and bolts. Fitted with high security, anti-drill radial pin tumbler lock, complete with 2 keys. Finished in Zinc pacifate and coated in bright yellow for visual deterrence and protection. Insurance approved.