The small black super tough 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 10.24” x 13.19” and the durable polycarbonate flap measures 6.69” x 9.45”. Built for frequent and heavy use by pets, this super tough pet door is noncorrosive and weather resistant meaning it'll last for years to come. The built-in locking pins allow 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 super tough pet door is designed to last