This beautifully designed, high-quality patio pet door inserts into the frame of your sliding glass door and automatically adjusts to the proper height. Heavy-duty aluminum construction. Shatter-resistant, tempered safety glass. Latch lock assembly enables sliding glass door to lock. UltraSeal� all-weather, energy-conserving flexible flap system reduces energy loss. Great for pets up to 130 lbs. and 30" high at shoulders. Spring-loaded height adjusts automatically from 76 3/4" to 81", step-over rise 9�, 10"