This sliding glass dog door lets your pet come and go without you opening the patio door, and it's built for small to medium dogs with a 10 1/4 x 16 1/4 inch flap. The frame height adjusts from 75 7/8 to 80 11/16 inches, so it fits a range of sliding door track heights without any cutting or permanent modification. An aluminum alloy frame and tempered glass window stand up to daily weather, and an upgraded metal plate with a new hinge structure keeps the flap working smoothly even in cold temperatures. A locking mechanism lets you secure the panel at night, while you're away, or whenever you want to keep your pet inside. At 18.19 pounds, the whole unit slides directly into your existing patio door track with no tools required, making it a practical option for renters or anyone who wants a non-permanent pet door solution.