These heavy-duty undermount drawer slides are designed for under-stair cabinets, deep drawers, and other demanding storage applications. Built from carbon steel, they support up to 260 lbs per pair and feature a 3-stage full-extension design for full drawer access. Ball bearing construction and an integrated silencer help provide smooth, quiet opening and closing. Their hidden undermount style creates a clean look while maintaining strength and stability. Ideal for DIY replacements or new cabinet installations.