Designed to complement the Marks USA locksets, the HI-SECURITY Program allows for expansion into the patented key control segments. HI-SECURITY is pick, drill and bump resistant, and features hardened steel sidebars and patented key control. The locking principle includes the combination of standard pin tumbler cylinder with a side bar locking mechanism corresponding to a security code designated by unique shaped side pins corresponding to a factory milled groove on the key.

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