NOTE! ! !: Please measure your door frame height, track width, pet width, pet height before purchaing. DESIGNED FOR LARGE PETS: This patio dog door features a flap opening of 14.3" W x 23.5" H, perfect for medium or large pets up to 120 lbs. SECURE LOCK: Comes with a toggle lock to secure the pet door to sliding door. This ensures safety and prevents gaps between the two doors. ADJUSTABLE HEIGHT: The durable aluminum patio dog door insert is adjustable in height from 44" to 84.25", ensuring a perfect fit in your existing sliding door track. Convenient Slide-In Panel: The slide-in panel allows you to control pet access effortlessly, and prevent wild animals from entering your home.