Cardinal Gates Patio Door Guardian 

The Patio Door Guardian effectively secures and childproofs sliding patio doors in homes and balcony doors in apartments and condos. Created with home security in mind, this lock is also ideal for childproofing. Prevent children from leaving the home unattended.

Attractive and functional, the Patio Door Guardian also allows you to lock the door with a 3” gap for ventilation. It works on right and left handed doors. Recognized as “one of the best new child safety products” by the National Safe Kids Campaign in Washington, D.C., the Patio Door Guardian works double duty as both a security device and as a childproofing lock.