Enclosed Outdoor 36"x24" One Door Aluminum Walnut Wood Look Directory Changeable Letter Board Product dimensions are 24"W x 36"H (1 door unit). The unit is vented for moisture reduction and the rear panel is weatherized. 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 and a thick rubber door seal. 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.