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Using Hook Locks to Secure the Contents of Your Van Hook locks are a great option to increase the security of your van. They are easy to set up and work independently of your van's main locking system. Gunnebo Industries, now Crosby created the self-locking swivel hook in order to enhance safety at construction sites. These hooks snap closed under load to prevent snatching and falling off overhead lines. Loop Wire Hook Locks Easily secure merchandise and accessories with these locking hooks that connect to loop wire hooks to prevent theft. These locks are