Tired of being your pet's doorman? This all-aluminum pet door lets your cat or small dog (up to 22 lbs) come and go on their own through an exterior or interior wall. The whole frame is aluminum, so it won't rust, crack, or warp like plastic or iron ones might. The tunnel expands to fit walls between 3.95 and 7.5 inches thick. It has two magnetic flaps that seal tight to block drafts, dust, and bugs – plus they're soft and quiet. There's also a locking panel you can slide in to close it off completely (great for security or at night). The flap opening is 10 x 6.5 inches – perfect for most cats and small dogs. Installation requires cutting a hole in your wall, but it comes with a template and instructions. The flaps are also easy to remove for cleaning. A well-built, permanent solution for pet independence.