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Using Hook Locks to Secure the Contents of Your Van Hook locks are a great method to increase the security of your van. They are simple to install and operate independently of your van's main locking system. Gunnebo Industries (now Crosby) created the self-locking hook to enhance security on construction sites. The hooks snap shut when under load to prevent grabbing and falling off overhead lines. Loop Wire Hook Locks Easily secure merchandise and accessories with these locking hooks that attach to loop w