When a more economical option is needed, choose ADP's Standard Directory Board Cabinets. The 1/4" black grooved back panel holds easy-to-read white letters. Tempered glass doors with piano hinges lock to prevent tampering of information. These handsome cabinets are ideal for building entrances, corridors or offices. Or use on food or retail areas for posting menus, prices, or daily information. The standard cabinets are framed with 1”W x 2”D anodized aluminum tubing. Internal depth is 1". Each hinged door features a pinch-proof, full-length piano hinge.