VOSOIR All-Aluminum Alloy Dog Door - The whole dog door is made of full high-quality aluminum alloy, reinforced by a higher-end welding process to make it more solid. Compared to the market plastic dog door, durability has greatly improved; compared to the market iron pet door, the aluminum alloy pet door is lighter, solid, and not easy to deform and rust, and the paint does not flake! Dog Door Size - Our premium large-sized dog door features expandable channels that fit walls from 3.95 to 7.5 inches thick. The flap opening measures 18.7 x 9.92 inches, perfect for large-sized animals weighing up to 110 pounds. Please carefully review the size chart to confirm if the size is suitable before purchasing. Energy Efficient - Our pet door features advanced PA material with a brown+black translucent panel that blocks UV rays and insulates hot or cold air 50% more effectively than traditional baffles—making it ideal for extreme weather. The upgraded magnetic seal and high-density dust strips create a tighter barrier, ensuring the flap stays securely in place while keeping out dust, bugs, and wind. Closing Panel & 2 Aluminum Locks - The wall-mounted dog door comes with a removable locking panel to secure the pet door when not in use. Both sides feature aluminum locks for added safety: when locked from the inside, the panel cannot be opened from the outside, so your home's security stays intact. Easy to Install - Designed for indoor and outdoor walls, our pet door is quick and simple to install. The package includes screws, step-by-step instructions, a cutting template, and everything else you need. Just follow the guide, and your dog door will be ready in no time! Meet your pup's dream door! The VOSOIR Double Flap keeps your home cozy and your furry friend happy. With its super-warm 2-flaps, adjustable tunnel (fits walls 4"-7.5"), secure locks, and tough all-aluminum build, it's built to last. Super easy to install, energy-saving, and that sleek silver finish looks great! Give your buddy the freedom they love, breeze-free.