https://www.openlearning.com/u..../mcnamararoberts-sm2
L4V Hook Deadlocks L4V hook deadlocks are an upgrade for front and side van doors, as well tailgates and doors to the cab. They work independently of the locking system and are secured by a high-security keys. This product, created to ward off 'peel-and-steal' attack It has been tested by an independent lab and has the potential to increase resistance by up to 300 percent. It is perfect for couriers with multiple drops or in situations where the driver might overlook lockin