Equip your semi to be Ready for the Road Ahead , with the Todco 1" Steel Precision Machined Door Roller, a key component to provide your semi with a smooth and reliable spring-operated door assembly. Thanks to precision manufacturing, this replacement roller is the ideal solution to keep your roll up door in the tracks when opening or closing. Constructed with rust and corrosion-resistant metals for extended use in harsh conditions and humid climates. FleetPride is your First Click in Heavy Duty .