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Using Hook Locks to Secure the Contents of Your Van Hook locks are a great way 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 hook in order to increase the safety of construction sites. The hooks snap shut when under load to prevent snatching and falling off overhead lines. Loop Wire Hook Locks These locking hooks with mechanical locks are designed