Open Box item...new condition * This sliding door security bar with a childproof lock acts as a visual deterrent against burglars who can see it clearly through the glass. The anti-lift childproof locking system prevents the bar from being lifted * This sliding door lock easily extends from 15.7 to 26.75 inches and can be installed on patio doors, sliding glass doors, and it can also act as a balcony door lock; it can be adjusted to allow the door to partially open for ventilation while being secured and locked * The incremental lock adjustment allows you to install pet doors, or leave the door open for ventilation, all while locking your sliding door in a secure position; use the rotating bracket to move the door stopper upwards and to the side for compact storage