Update your semi's spring-operated door assembly with increased reliability and smoothness, with the Transglobal 4.5" Steel Roll Up Door Bottom Fixture that ensures you're Ready for the Road Ahead™. This replacement bottom fixtures ensures your roll up door can easily open and close, without damaging itself on the way down. Manufactured with corrosion and rust-resistant metals for extended use in harsh conditions and humid climates. FleetPride is your First Click in Heavy Duty®.