[MAVRICPOWER] Steel Large Cat Door for Door, Cat Door with Two Sliding Panels for Extreme Weather,Never Rust Small Pet Door for Dog Up to 20 lbs

Flexible Size‘The dog door with expanding tunnel fits paneled, wood, PVC, and metal doors or walls of 1 3/8'' - 2 1/8'' thick. | Strong Dog Door‘Our Dog door are made out of Strong Steel,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‘Two adjustable 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 dog 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.