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This product works on door wall sliding doors that are mounted on the ‘inside’ track of the door assembly and will not work on the door wall sliding door that is on the ‘outside’ track of the door assembly. Nightlock Patio for Sliding Doors! Helps prevent home invasion & burglary! Barricade all of your doors. ‘Don’t Stay Home Without It!’ Real security to help protect your home and family. The NIGHTLOCK PATIO uses the strength of the floor. It can withstand tremendous force. Anchored securely to the floor, NIGHTLOCK adds extra security to your Sliding Doors! Block your Patio Sliding Door with ‘Nightlock’ to be sure! The NIGHTLOCK uses the strength of the floor.