The Tennsco Boltless Shelving Add-On Unit is an all-steel shelving system that can be added onto existing Tennsco boltless shelving units. It has four shelves that provide an additional 16 square feet of storage space. The shelves are adjustable in 1-inch increments and can hold up to 800 lbs evenly distributed. The unit is 5 feet high x 4 feet wide x 18 inches deep. Assembly required using Tennsco's boltless design with easy connect technology. Available in a gray epoxy finish that is resistant to solvents, acids, and alkalis. Provides sturdy and customizable storage for warehouses, garages, retail stores, and more.