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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 set up and work independently of your van's primary locking system. Gunnebo Industries (now Crosby) created the self-locking hook to enhance safety on construction sites. These hooks snap shut under load and prevent falling off or grabbing overhead lines. Loop Wire Hook Locks Secure your items and accessories with these lock