Sliding doors can be easy for thieves to enter. They can force open the lock with a screw driver or simply lift the door off its tracks.

Swing-down aluminum bars called "Charlie bars" offer protection. They have a pin lock to secure them against the back of the sliding door. With a Charlie bar, the only way a burglar can get in is to break the glass. For optimum security, add a glass break detector, which will activate an alarm the moment the glass is broken.

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