For trouble-free storage and retrieval of inactive files that need to be retained for future reference or tax purposes. Heavy-gauge steel frame easily locks together without tools. Warp-free particle board shelves provide maximum strength to support heavy loads. Supports up to 900 lbs. per shelf. Designed to hold up to eighty 12"W x 15"D x 10"H letter/legal archival storage boxes. Steel Pack and Particleboard Shelves are shipped separately ‚¬â€œ ORDER BOTH. Storage boxes not included.