ADCWW3630R Enclosed Oak Wood Look Aluminum Frame Directory Board has a unique powder coated process that combines the rich appearance of natural hardwood with the rugged and enduring qualities of extruded aluminum. Units are made of custom extruded parts engineered to provide accurate durable and handsome Cabinet. All corners are neatly mitered and assembled with heavy duty reinforcements and fasteners. Lockable doors are mounted with a full length piano hinge and feature acrylic safety glass windows. The fixed rear panel is a felt cover letter board designed to accommodate changeable letters with tabs spaced on 1/4 centers.