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Using Hook Locks to Secure the Contents of Your Van Hook locks are an excellent method to enhance the security of your van. They're easy to install and operate independently from the main lock on your van. Gunnebo Industries (now Crosby) developed the self-locking hook to increase the safety of construction sites. The hooks snap shut under load to prevent snatching and falling off overhead lines. Loop Wire Hook Locks These locking hooks with mechanical locks are designed to lock down merchandise