Product Details: Update your semi's spring-operated door assembly with increased reliability and smoothness, with the Whiting 1.5" Roll Up Door Complete Hinge Assembly that ensures you're Ready for the Road Ahead™. With a low-friction design, this replacement hinge assembly is the ideal choice to make certain your roll up door can open and close without jamming or locking. Built with corrosion and rust-resistant metals for long-term durability in harsh conditions and humid climates. FleetPride is your First Click in Heavy Duty®.