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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're easy to set up and operate independently from the main lock on your van. Gunnebo Industries (now Crosby) developed the self-locking hook to enhance safety on construction sites. The hooks snap shut under load to prevent grabbing and falling off overhead lines. Loop Wire Hook Locks These locking hooks with mechanical locks are designed to secure merchandise and accessories. The