Easy to fit, no tools required for assembly_ Constructed from robust steel_ Stops opportunist theft in its tracks__Suitable for caravans, trailers, trailer tents, horse boxes, vans and motorhomes, Stronghold Apex Triangular Wheel Clamps use a unique high security patented locking system and robust steel construction to deter any opportunist thief from stealing your vehicle.__ The 2 part triangular steel sections covers the wheel nuts, wheel trims and alloy wheels.__Tyre diameter: min 504mm - max 704mm Tyre width: 165mm Fully adjustable (set once only) for wheel diameter Rubber on backplate to prevent wheel damage Unique high security patented locking system High security pick-free lock, supplied with 3 keys Fits in under a minute, no tools required Water and corrosion resistant Approved to Sold Secure Gold standard Secured by Design approved Kit contents:_ Wheel clamp top plate_ Wheel clamp back plate_ Top arm_ 2 x adjustable arms_ Locking adaptor_ Lock with three keys_ Fitting instructions and warranty card