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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 easy to install and operate independently of your van's main locking system. Gunnebo Industries (now Crosby) developed the self-locking hook to improve safety on construction sites. The hooks snap shut under load and prevent snatching or falling off overhead lines. Loop Wire Hook Locks Easily secure merchandise and accessories with these mechanical locking hooks that atta