Designed for Small Pets: With a door flap size of 8 1/4 x 12 1/4, this dog door for sliding glass door provides a spacious and comfortable passage for your pet. Whether it's a small dog or a cat, this size is ideal for easy access Adjustable Height: The doggie door for sliding glass door is height-adjustable from 91 to 96 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