Allows your pet to come and go as he pleases, through your sliding glass or screen door. These panels feature a heavy-duty aluminum construction and shatter-resistant, tempered safety glass. Equipped with the energy-conserving UltraSeal flexible flap system designed to keep the heat and cold outdoors. Installation is easy, with no cutting required. Simply slide the panel into one end of your sliding door track and secure it to the frame. Fits left or right sliding glass doors, 76 13/16 to 81 inches tall. T brackets included for recessed sliding glass doors. PetSafe Freedom Patio Pet Doors for Sliding Doors allow your pet to come and go as he pleases, through your sliding glass or screen door. These panels feature a heavy-duty aluminum construction and shatter-resistant, tempered safety glass. They’re also equipped with the energy-conserving UltraSeal flexible flap system designed to keep the heat and cold outdoors. Installation is easy, with no cutting required. Simply slide the panel into one end of your sliding door track and secure it to the frame. Open and close the other side of your door easily. And if you ever need to move, you can easily remove the panel from the frame and take it with you. Fits left or right sliding glass doors, 76 13/16 to 81 inches tall. Does not fit recessed sliding glass doors without additional hardware