Quick-lock design for easy assembly Strong steel exterior and shelf construction, as well as a solid fiberboard back. Includes attractive, plastic radius corners. 12"-deep shelves adjust at 1" intervals (at time of assembly) to easily accommodate ring binders and large publications. Each shelf holds up to 70 lb. evenly distributed. Shelf count includes the bottom of the bookcase. Greener choice - contains 50% total recycled content with 25% postconsumer recycled content.