The Small Black Essential Pet Door is suitable for pets up to 20 lbs. Designed for doors, walls, and screens up to 2.17” thick, the outer frame measures 8.82” x 11.57” and the flexible clear flap measures 6.69” x 9.45”. Built for frequent and heavy use by pets, this Essential Pet Door is noncorrosive and weather resistant meaning it'll last for years to come. The included locking panel allows for two-way controlled access for your pet and the magnetic centring flap ensures the door shuts after each use. The small frame suits small sized breeds, including most Cats, Chihuahuas, Papillons, Yorkies, Pomeranians, Maltese, French Bulldogs and more. Have complete peace of mind knowing that the Essential Pet Door is designed to last and includes a 1-year limited manufacturer's warranty. Give your pet the freedom to roam with a Hakuna Pets pet door.