Made of extruded aluminum, Salsbury slim surface mounted letter boxes are 11"e; W x 19"e; H x 3-3/4"e; D and are available for private access applications only (includes factory installed commercial lock #2246). Units mount directly to a flat surface and are secured with mounting hardware (not included) through the back panel. Slim surface mounted letter boxes feature an 8"e; W x 3/4"e; H mail slot. Custom slots (related item #2249) and custom engraving (related item #2266) are available as options upon request. Plexiglass windows (related item #2273) and a non-locking thumb latch (related item #2288) are also available as options upon request. Slim surface mounted letter boxes are ideal for offices and many other applications.