This sliding glass dog door lets large dogs and cats come and go on their own while keeping your sliding door track intact. The flap measures 13 5/8 x 23 5/8 inches, giving bigger pets plenty of room to pass through, and the frame height adjusts from 75 7/8 to 80 11/16 inches to fit most standard sliding door openings. Built with an aluminum alloy frame and a tempered glass window, it holds up to daily use, and the upgraded hinge structure keeps the flap swinging smoothly even in cold weather so it won't crack or stick. When you need to keep your pet inside overnight or while you're away, the built-in lock secures the flap shut. Installation takes no tools, the frame slides into your existing patio door track, a practical option for renters who'd rather not drill into a door frame. At 22.6 pounds, it's easy enough for one person to install, with a brown finish that blends with most frames.