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L4V Hook Deadlocks L4V hook deadlocks are an upgrade to side and rear van doors, as well tailgates and doors to the cab. They work independently of the manufacturers locking system and are secured by a a high-security key. Designed specifically to combat attacks of 'peel and steal' this product has been tested by an independent lab increasing resistance by as much as 300%. It is ideal for multi-drop couriers as well as applications where th