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