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Using Hook Locks to Secure the Contents of Your Van Hook locks are a great option to improve the security of your van. They are easy to install and work independently of your van's primary locking system. Gunnebo Industries, now Crosby created the self-locking swivel hook to improve safety at construction sites. These hooks snap closed under load to prevent grabbing and falling off overhead lines. Loop Wire Hook Locks Secure your items and accessories with these locking hooks that connect