Indoor directory boards and changeable letter boards. An attractive and secure way to display directory listings, messages notices and directions. Our indoor letter boards have a grooved felt for use with our tabbed directory board letters. Most of the indoor enclosed letter boards use tempered safety glass windows and have locking doors. Indoor cabinets are available in aluminum, bronze powder-coated or a handsome solid oak. We also have free-standing units, open face units and a 3 in 1 combination option. Be sure to check out our selection of changeable directory board letters as well (sold separately)