Size Large Brand PETCOMING Color Black Material Aluminum Mattress Thickness 2.08 Inches About this item New Insulation+Two Flaps: Petcoming dog door adds an insulation flap among Two falps to Insulates against cold air outdoor and improves warmth performance. In the meantime, the magnetic strips equipped on the double flaps and the dust strips on the frame can enhance sealing and effectively prevent the dust, and insects. PETCOMING All Aluminum Dog Door: This dog door is made of selected high-quality aluminum alloy, which significantly improves its sturdiness. Compared with other metal dog doors, it's more durable and has stronger structural stability, excellent resistance to deformation, rust and corrosion, and the paint does not flake off. Dog Door Size Details: Equipped with a spacious 18.7 x 9.92 inches flap opening, this dog door is suitable for large dogs weighing up to 110 pounds. Its design includes adjustable channels that can perfectly fit door or wall with a thickness between 1.26 and 2.08 inches. Ensure Your Dog's Home Security: Our well-designed doggy door is equipped with a closing panel and sturdy aluminum security lock, which provides excellent durability and resistance to damage. Simply slide and lock the door panel when you are away from home to provide your dog with reliable security and prevent him from going out without permission. Easy Installation: We fully understand the needs of users, and provide guide video and user manel. Whether by using the manual or watching the installation guide video, you can easily and quickly complete the installation. And please ensure that the size and thickness of this product is compatible with your door/wall before start the installation.