The Deluxe Aluminum Pet Door with adjustable tunnel is designed for doors, walls, screens, and glass up to 2.76” thick. Built with a stylish and durable aluminum frame, the flexible flap with ultra-clear viewing window lets your pets see out but still offers privacy to your home. The magnetic centring flap ensures the door shuts after each use to keep the weather outside. Secure your home and control your pets access with the included sliding security panel, easily fit to lock the pet door from outside access. The Deluxe Aluminum Pet Door is designed to last and includes an industry leading 3-year limited manufacturer’s warranty. Give your pet the freedom to roam with a Hakuna Pets pet door.