Fits screens, doors, walls and glass up to 2.17 inches thick. Two-way locking pins offer maximum control over your pet's access. Fitted with a thick brush seal to help block drafts and strong magnets to keep the flap centered after each use. Made with a durable ABS frame plus a polycarbonate, UV-resistant flap. Give your BFF outdoor access anytime with the Hakuna Pets Super Tough Dog & Cat Door. This pet door is designed for use with doors, walls and screens up to 2.17 inches thick. Built for frequent and heavy use by pets, this super tough pet door is noncorrosive and weather resistant for years of quality service. The built-in locking pins offer two-way controlled access for your pet, and the magnetic centering flap helps keep the door shut after each use. Give your furry friend the freedom to roam with Hakuna Pets!