If you are leaving your Caravan, Camper Trailer, Boat or general purpose trailer unattended for a prolonged amount of time you should invest in a lock to help prevent it being towed away. This Saracen lock is manufactured from hardened high-strength steel which is highly resistant to drilling and cutting, and it incorporates a British-made Lowe & Fletcher 9-level barrel key lock which is resistant to picking, drilling and gas freezing, etc. Suits trailers fitted with Al-Ko type hitch couplings. A must for trailers permanently street-parked.