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Using Hook Locks to Secure the Contents of Your Van Hook locks are a great way to increase the security of your van. They are simple to install and work independently of your van's primary locking system. Gunnebo Industries (now Crosby) created the self-locking hook to improve security on construction sites. These hooks snap shut when under load and prevent snatching or falling off overhead lines. Loop Wire Hook Locks These mechanical locking hooks are designed to secure products and accessories. They function with