An insurance approved device for securing caravans and trailers with 19mm adjustor bolt heads, which has Stronghold's Diamond 5 high security rating.It is rustproof, waterproof, dustproof and corrosion proofIt has a dual locking system, coming supplied with a 3 hexagon adjustor keys, and a minimum of ten thousand key combinationsIt can be used in conjunction with any Stronghold Hitchlock, Wheelclamp, Hitch or Security Post._Attributes Height (cm)0.7 Width (cm)3.8 Materialzinc electro-plated Weight (g)400 Recommended UseTravelling