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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're simple to install, and they work independently from the main lock on your van. Gunnebo Industries, now Crosby has developed the self-locking swivel hook to increase safety on construction sites. The hooks snap shut under load and prevent snatching or falling off overhead lines. Loop Wire Hook Locks Secure your items and accessories with these mechanical locking hooks that mate