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American Standard Overhead Door Parts Set Heavy Duty Hinges & Nylon Rollers. 100% Virgin PA6 Nylon Rollers: Equipped with premium PA6 nylon rollers for whisper-quiet, high-cycle operation. Heavy-Gauge Galvanized Steel: Hinges and brackets are stamped from thick, rust-resistant steel for maximum load. Commercial Ready: Strong enough to support heavy warehouse doors (10x10, 12x12) and standard lift track systems.