Efficient, high-density EDSAL Record Storage system holds up to 80 file boxes per unit. 84" high, 4-shelf units increase capacity by 1/3 over 60" high, 3-shelf units. All steel racks feature fast trouble-free assembly—no special tools, bolts or clips necessary. Rivets on shelf beam engage into upright keyhole slot. Double-rivet construction locks shelves rigidly into position and prevents wobble and sway without the use of cross braces. This allows convenient access to boxes from all sides. Shelves adjust in 1 1/2" increments. Baked-on phosphatized gray enamel finish resists rust and corrosion. Choose just shelving racks or racks complete with strong 5/8" particleboard decking and storage boxes with printed fronts for handy labeling.NOTE: Shelving units with 670- and 1150-lb. capacities include center support.