Designed for Medium-Sized Pets: With a door flap size of 10 1/4 x 16 1/4 in, this dog door for sliding glass door provides a spacious and comfortable passage for your pet. Whether it's a small dog or a medium-sized dog, this size is ideal for easy access Adjustable Height: The doggie door for sliding glass door is height-adjustable from 75 7/8 to 80 11/16 in, fitting various door frame sizes. This feature simplifies the installation process,making it easy for both beginners and experienced users Built to Last: The upgraded metal plate and new hinge structure ensure durability, even in cold temperatures. The aluminum frame and tempered glass provide a strong, stylish design, making the sliding glass pet door an ideal entry and exit for your pet Secure Locking Design: The lock easily secures the sliding glass dog door to restrict your pet's movement. It is ideal for nighttime, when you're away, or in specific situations, ensuring your pet stays secure at home Easy Installation: This sliding dog door slides easily into your patio door track with no tools required. It fits various sliding door track heights, making it an ideal choice for renters or anyone seeking a non-permanent solution