MAVRICPOWER Weatherproof Large Dog Door for Door, with Two Sliding Lock Panels, Aluminum Doggie Door for Exterior Door, Doggy Door for Large Dogs up to 80lbs

Flexible Size: The doggie door with expanding tunnel fits paneled, wood, PVC, and metal doors of 1 3/8'' - 2 1/8'' thick. The large dog door flap opening is 11 1/8”(W) x 16 1/4''(H).. Strong Dog Door: Dog doors for large dogs are made out of Rugged Sturdy Aluminum, strong and durable for active dogs without worrying about breaking and bitten easily.. Two Magnetic Flaps: Magnetic Flap of dog door designed to enable the door plate to quickly reset after being lifted, as well as keep an even tighter seal when closing.. Double locking panels: The dog door with two locking panels, which not only lower or raise the height of your dog go through, but also reduce heat transfer in rough weather, and keep other unwanted visitors out of the house.. Easy to Install: The doggy door that provided with cutting template and step-one-step installation guide,and installation hardware( Self-tapping screw, rivet,etc). Notice: it will be better to use rivet tool for hollow door to further secure.