Archival Shelving is specifically designed to hold archival storage boxes. Maximum capacity is eighty 12" x 15" x 10" boxes (sold separately). Warp-free particleboard shelves provide maximum strength to support heavy loads. Shelves adjust in 1" increments. The heavy-gauge steel frame (sold separately) with a powder-coat finish easily locks together without tools. Archival shelving supports an overall 2,500 lb. (evenly distributed) and 900 lb. per shelf. You must order both shelving and steel frame (SAF5260) for complete unit..