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L4V Hook Deadlocks L4V hook-deadlocks are a great upgrade for back and side van doors as well as tailgates or doors to the cab. They are not tied to the locking system of the manufacturer and secured with a high security key. This product, which is designed to stop 'peel and steal' attacks has been tested independently and can increase resistance by up to 300%. It is ideal for multi-drop couriers and other applications where the driver is unable to lock the vehicle door. Hook Deadlock A Hook Deadlock is an