These Vevor heavy-duty drawer slides are designed for demanding storage applications with a 500 lbs load capacity and a full extension design for easy access. Made from cold rolled steel, they provide durable support for cabinets, industrial drawers, RVs, trucks, and commercial equipment. The lock-in and lock-out mechanism adds stability and security during use. Double-row ball bearings and a nylon buffer help deliver smoother, quieter operation. The kit includes the slide set, screw kit, and user manual for installation.