Dog Door Size: Ownpets dog door size of inner frame is 8.74 * 12.52inches and the outline border measures 12.2 * 16.53 inches. The overall thickness of pet door is 2.6 inches. Suitable for medium or small dogs up to 40 lbs. Energy-saving Flap: Weatherproof magnetic closure and UV-resistant flap, Perfect for hot and cold climates,provides energy efficiency and helps protect against extreme weather. Solid Aluminum Frame: This type of doggie door for dogs is made out of Aluminum material that is proved to be sturdy and stainless. Do not worry about broken and bitten easily. High Security: It comes with a backplate and 2 locking pins to keep you and your family safe at night or not at home, keep other creatures out of the house. Easy to Install: The metal dog door is very easy to install, No need to plan your schedule around potty breaks, your four-legged friends can come and go on their time. This pet door is made from metal material with a great deal of outstanding features, such as high strength, sustainability, reliability and toughness. It can be used for a long period of time. Moreover, the metal back plate can help you close the pet door at night to ensure safety.