... steel plate and Nylon(Not Plastic) Zinc-galvanized Finished Non-rust & Long using cycle All garage door hardware are made of ... plate.The surface treatment is Zinc-Galvanized Process Treatment, Non-rust. Garage Door Hinges include 1#, 2#, 3#, 4#, 5# Hinges ... , Torsion Springs, Rollers, Cable Drums, Track Kits, Brackets, Emergency Lock, Handle