A single highly visible lock suitable foruse on the rear door or off side sliding door. It adds further security to the van to guard against thieves capable of defeating the factory fitted locks. The Bulldog Van door lock is: Simple to fit with no loose parts. Can be locked without the use of the key. Drill and pick resistant, case hardened steel. Highly effective deterrent. Avoid costly repairs for locks and bodywork. "As used on fleet vehicles by major utilities"