Prepare your semi to be Ready for the Road Ahead , with the Whiting 2" Steel Roll Up Door Roller that provides your vehicle with a smooth and reliable spring-operated door assembly. This replacement steel roller ensures your roll up door can open and close with ease, while moving along the existing track. Crafted with rust and corrosion-resistant metals for long-term durability in humid climates and rugged conditions. FleetPride is your First Click in Heavy Duty .