Enclosed Indoor 36"x24" One Door Aluminum Walnut Wood Look Directory Changeable Letter Board Product dimensions are 24"W x 36"H (1 door unit). All corners are neatly mitered and assembled with heavy duty reinforcements and fasteners. Concealed mounting brackets are provided. 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. Includes a set of 165 count - 3/4" Helvetica letters.