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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're easy to set up and work in isolation from the main lock in your van. Gunnebo Industries (now Crosby) created the self-locking hook in order to improve security on construction sites. The hooks snap shut when under load to stop snatching and falling off overhead lines. Loop Wire Hook Locks These locking hooks with mechanical locks are designed to secure products and ac