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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 has developed the self-locking swivel hook to increase safety on construction sites. The hooks snap shut when under load to prevent snatching and falling off overhead lines. Loop Wire Hook Locks These mechanical locking hooks are designed to secure items and ac