These heavy-duty drawer slides are built from cold rolled steel with a zinc-plated finish for strength, durability, and corrosion resistance. The 3-section full-extension design provides full access to the drawer while supporting loads up to 500 lbs. Dual lock-in and lock-out functionality helps keep the drawer securely positioned during use. Ball bearings and a nylon buffer support smooth, quiet sliding performance. Ideal for industrial drawers, cabinets, commercial equipment, RVs, trucks, and retrofit projects.