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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're simple to install and operate independently from your van's main lock. Gunnebo Industries, now Crosby created the self-locking swivel hook in order to enhance safety at construction sites. The hooks snap shut under pressure and prevent falling or grabbing onto overhead lines. Loop Wire Hook Locks Secure your items and accessories with these locking