First Watch Security 1110 Night Bolt & Locking Cylinder, Brass ToneOf all burglary offenses, 81 percent of residential intrusions occur through the first floor. Todays consumers understand the importance of supplementing primary entrance door locks. First Watch Security offering to you Night Bolt & Locking Cylinder for auxiliary door security. Brass Tone Latch hold back (prevents locking yourself out) 5 pin tumbler with hardened steel pins 1 1 4" bore required Spring latch for automatic locking.