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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 set up and operate independently of the van's main locking system. Gunnebo Industries, now Crosby, developed the self-locking swivel hook to improve safety at construction sites. The hooks snap shut under load and prevent falling or grabbing onto overhead lines. Loop Wire Hook Locks Secure your accessories and merchandise with these mechanical locking hooks that attac