1-piece steel roll formed 1-1/2" x 1/2" bonded frame. This 1-piece bonded frame keeps patio screen door rigid for easy rolling, and reduces track jumping and bending. Spring-loaded adjustable hood with binder bolts for easy installation fits door openings 77-5/8" to 80". Top and bottom spring-loaded nylon wheels. Locking handle made of UV-resistant plastic. Vinyl bug flap to seal patio screen door against glass door. Charcoal fiberglass screen.