Offers trouble-free storage and retrieval of inactive files. Heavy-gauge steel frame easily locks together without tools. Warp-free particleboard shelves support up to 900 lbs. each. Designed to hold up to 80 letter/legal archival storage boxes 12w x 15d x 10h, sold separately. To complete the unit, you must order both the frame: Safco 5260 Archival Shelving and the shelves: Safco 5261 Particleboard Shelves. Shelf Count: 4; Shelf Thickness: 0.5in; Shelf Capacity Weight: 900 lbs; Materials: Furniture Grade Particleboard.