For Outdoor use only. Aluminum Directory Cabinets 36"h x 24"w (1 door unit) Manufactured of custom extruded, parts engineered to provided a durable and handsome cabinet. Felt fixed rear panels are designed to accommodate changeable letters with tabs spaced on 1/4" centers. Standard features include: Lockable doors, acrylic safety glass windows, continuous hinges, concealed mounting brackets and a slotted background in felt. Satin anodized finish. Includes a set of 165 count - 3/4" Helvetica letters.