Product Details: Equip your semi to be Ready for the Road Ahead™, with the Whiting 2" Roll Up Door Steel Roller, a key component to provide your semi with a smooth and reliable spring-operated door assembly. Thanks to its robust steel design, this replacement roller is the ideal choice to slide your coiled or hanging roll up door along the track. Manufactured with corrosion and rust-resistant metals for extended use in harsh conditions and humid climates. FleetPride is your First Click in Heavy Duty®.