These heavy-duty drawer slides are designed for smooth, quiet operation and full-extension access. Built from high-hardness steel with a galvanized finish, they offer strong durability for cabinets, industrial drawers, RVs, trucks, and other storage applications. The locking design helps keep drawers secure during movement, while double-row ball bearings support stable sliding performance. This pair is sized for 40" extension and is suited for drawers measuring about 40.5" long.