Access by combination or passage function, Passage feature controlled by either thumbturn or cylinder key, packed with both, Recommended for high traffic security sensitive applications, The all-metal 1000 Series is U.L. Listed for A label doors, 1/2" deadlocking solid brass latch locks automatically when the door is closed unless the optional passage feature is activated to allow free access, Thousands of changeable combinations, Latch and hand are reversible on-site, Allows free egress at all times, No electrical wiring, Door Thickness: 1-3/8" to 2-1/4" thick, Deadlocking Latch: 1/2" throw