Break-In Protection for Less Fearful, More Relaxed Home Police respond to home alarms quite frequently to find it was the security bar that prevented the homeowners from being victimized. By adding another layer of security to your door with the Master Lock No. 265 Security Bar you can increase the chances of escaping with just some broken glass, or a damaged lock. This security bar may be the difference between a lengthy police investigation because your home was completely burglarized, and a short one that they can mark down as an attempted intrusion.