Prepare your semi to be Ready for the Road Ahead™, with the Todco 4.25" Steel Roll Up Door Bearing Assembly that provides your vehicle with a smooth and reliable spring-operated door assembly. With all the necessary components to keep your door in place, this replacement bearing kit is the ideal solution to guarantee your door gently opens and closes without hangups. Fashioned with rust and corrosion-resistant metals for extended use in rugged climates and harsh conditions. FleetPride is your First Click in Heavy Duty®.