Salsbury 2400 series data distribution system aluminum boxes have 1/4"e; thick extruded aluminum doors with a durable powder coated aluminum finish. Each door includes a 3/4"e; high door slot, a five (5) pin cylinder cam lock with two (2) keys and is hinged horizontally at the bottom. Alternative locking systems (see related items) are available. Doors are available without slots upon request. The compartments have open backs (rear covers – related item #2451 – are available as an option upon request) and are constructed of 20 gauge steel. All units have the same outside dimensions. Data distribution system boxes are designed to be installed between rack ladders (#2400). The rack ladders support five (5) units to form a column of boxes. Data distribution system boxes can also be used in Free-Standing Rotary Mail Centers and Free-Standing Roll-A-Bout Mail Centers.