Seco-Larm SD-997B-1SQ Mini Surface-Mount Electric Deadbolt, Fail-Safe Operation, Magnetic Switch Senses Door Position for Positive Locking, Lock Delay Timer Adjustable Between 0 and 3 Seconds

Surface-mount design for easy installation Aluminum alloy bolt, 15/32" (12.7mm) diameter, 9/16" (14mm) throw Automatically relocks after 6 seconds if the lock was unlocked but the door was not opened Lock delay timer adjustable between 0 and 3 seconds Use with an optional digital keypad for high security without a key