Maintain full use of your sliding glass patio door while allowing your pet to come and go as he pleases. Easy to install, this beautifully designed dog door simply inserts into the frame of your sliding glass door and adjusts to the proper height. Your sliding door remains functional and locks to the dog door with the included latch assembly. Heavy duty aluminum construction with shatter-resistant, tempered safety glass. Sliding glass pet door flap utilizes UltraSeal to reduce energy loss. Spring-loaded overall height adjusts from 76 3/4 "-81"H. Assembly required.