VEVOR Pet Door, 31.2 x 43.5 cm Metal Frame with Lock and 3-Flap System, Weatherproof Doggy Door, Easy to Install in Interior or Exterior Walls, Pet Door Suitable for Cat Doggie Kitties (White-Medium)Product Features High Quality Materials Built with a sturdy metal frame and frosted PVC door flaps, this flap pet door is designed to withstand wind, rain, and cold, making it ideal for all weather conditions. It offers long lasting and reliable performance. Fits Various Wall Thicknesses Our dog door is suitable for walls with a thickness of 4. 75" 7. 25" 12. 07 18. 42 cm, and it comes with a detailed installation guide and all necessary hardware.