These heavy-duty full extension drawer slides are built from high-hardness steel for durable, stable performance in demanding storage applications. The dual-lock design helps keep drawers securely in place, while double-row ball bearings and nylon cushioning promote smooth, quiet operation. A galvanized finish adds resistance to rust and wear for long-term use. Designed for side-mount installation, they are suitable for cabinets, industrial drawers, RVs, trucks, and vending machines. This listing is for one pair of 56" drawer slides.