The Quantum Storage Systems HD21-2 Single Unit Skate Assembly Kit is designed for effortless movement and installation of shelving units. The kit includes two 21-inch skates with a patented design for easy setup. Each skate has a high load capacity of 1,500 lbs per shelving unit and features a corrosion-free construction, ensuring durability even in challenging environments. The V-groove floor track enables smooth movement, and the kit's modular design allows for customization by ordering shelves and posts separately.