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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 set up and work in isolation from your van's main lock. Gunnebo Industries (now Crosby) created the self-locking hook to increase safety on construction sites. The hooks snap shut when under load to prevent grabbing and falling off overhead lines. Loop Wire Hook Locks Secure your accessories and merchandise with these locking hooks that connect to loop wire hooks to prevent