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L4V Hook Deadlocks L4V hook deadlocks are an upgrade for front and side van doors, as well tailgates and doors to the cab. They function independently of the manufacturer's locking system and are secured by a a high-security key. Specially designed to ward off attacks of 'peel and steal' this product has been tested independently increasing the resistance to 300%. It is perfect for multi-drop couriers and applications where the driver might not lock the door of their vehicle. Hook Deadlock A hook deadlock is a lock that can be put on the vehicle's d