Nylon track wheel rollers designed for chain link rolling gates. This 2-pack set fits 1-7/8 inch gate frames and 1-5/8 inch track pipe only. The safety-style wheels feature a curved retainer bracket that keeps the gate on track during operation. Nylon construction with high-quality ball bearings reduces friction for smoother rolling. Commercial and industrial strength with a limited lifetime warranty. Requires measuring both gate frame and track pipe outside diameter before purchasing.