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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 are easy to install and operate independently of the van's main locking system. Gunnebo Industries, now Crosby created the self-locking swivel hook to enhance safety at construction sites. These hooks snap shut when under pressure and prevent falling off or grabbing overhead lines. Loop Wire Hook Locks These mechanical locking hooks are designed to secure merchandise and accessories. They work with loop wire hooks