[Professional Pet Supplies]Designed for dogs. Let your pet have a better living experience, please pay attention to pick the right size of dog door. [Weatherproof and Energy-efficiency]The extra large dog door is made of aluminium alloy with two flaps and panels for better protection against extreme weather condition. [Easy Installation] The extra large dog door for exterior walls comes with installation instructions and positioning holes for easy installation. [Patented Design - Pro 2.0]Dog door with telescoping tunnel can be installed on walls of different thickness of [4"-8"]. Frame:[17 1/3"W * 25 3/5"H]. Flap: [14 1/3"W * 25 3/5"H]. Suitable for pets up to [220 pounds]. [24/7 Customer Service]If you have any questions, please contact us at any time, we will give a reply within 24 hours. Sammak Dog Door for Wall , Heavy Duty Dog Door,X-Large Black