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Using Hook Locks to Secure the Contents of Your Van Hook locks are an excellent option to increase the security of your van. They're simple to install and work in isolation from the main lock in your van. Gunnebo Industries, now Crosby, developed the self-locking swivel hook to enhance safety at construction sites. The hooks snap shut when under load to prevent grabbing and falling off overhead lines. Loop Wire Hook Locks These locking hooks with mechanical locks are designed to lock