The Grainger General Purpose Boltless Metal Shelving is a freestanding shelving system made of steel with a load capacity of 655 lbs per shelf. The shelves are adjustable in 1" increments on the uprights using metal connectors without requiring tools or hardware for assembly. The shelving comes in various heights, widths, depths, and number of shelves. It's designed for general warehouse, retail, or industrial use for storage of medium weight items. The powder coated steel provides durability. This basic boltless shelving offers an economical storage solution.