Update your semi's spring-operated door assembly with increased reliability and smoothness, with the Whiting 2" Standard Roll Up Door Nylon Roller that ensures you're Ready for the Road Ahead. With a low-friction design, this replacement nylon roller is the ideal option slide your hanging or coiled roll up door along the 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.