Strong steel exterior and shelf construction together with a solid fiberboard back. Attractive, plastic snap-in radius corners make assembly easy and add to the overall strength of these units. Shelves adjust at 1" intervals during assembly. Fixed top, bottom and middle shelf. Generous 12" deep shelves accommodate 3-ring binders and large publications. Fixed bottom is counted as a shelf. Case measures 31-3/4"W x 13-1/2"D. Choice of printed steel in Medium Oak or baked enamel finishes in Black, Gray or Sand. Easy assembly with quick-lock fasteners.