[MAVRICPOWER] Aluminum Medium Dog Door with 2 Sliding Lock Panels, Doggie Door for Exterme Weahter, Never Rust Pet Door for Small Dogs Up to 30 lbs

Flexible Size‘The doggie door with expanding tunnel fits paneled, wood, PVC, and metal doors of 1 3/8'' - 2 1/8'' thick. The medium dog door flap opening is 8 7/8(W) x 12 1/4''(H). | Strong Dog Door‘Our Dog door are made out of Strong Aluminum,our dog door 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.