First Watch Security 1125-SP Double Cylinder Bolt Interlocking DeadboltOf 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 Double Cylinder Bolt Interlocking Deadbolt for auxiliary door security. Polished Brass Double cylinder bolt interlocking deadbolt with double cylinder 5 pin tumbler with hardened steel pins Single cylinder locking unit & strike Locks