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Using Hook Locks to Secure the Contents of Your Van Hook locks are a great option to improve the security of your van. They are easy to set up and work independently of the van's main locking system. Gunnebo Industries (now Crosby) developed the self-locking hook to enhance security on construction sites. The hooks snap shut under load and prevent falling or grabbing onto overhead lines. Loop Wire Hook Locks Easily secure merchandise and accessories with these mechanical locking hooks that attach