Salsbury Industries 2212 Aluminum Mailbox, 12 Doors, Rack Ladder System, Aluminum with Black Trim Unit dimension: 23-1/4" W x 12-1/8" H x 15-1/2" D Doors dimension: 3-1/2" W x 5-1/2" H Compartments have open backs Doors are made of 1/4" thick extruded aluminum Each door includes a 5 pin cylinder cam lock (with 2 keys)