4C horizontal mailboxes for Private Access, Ideal for colleges, schools, private postal centers, corporate mail centers, military bases, government agencies and many other applications, For indoor or outdoor use, Constructed of heavy duty aluminum and stainless steel hardware, Doors include a heavy duty cam lock with a dust/rain shield and 3 keys, MB1 doors are 13-1/4"" W x 3-1/4"" H, A compartment equivalent to two 3-1/4"" high standard doors is used for outgoing mail collection and is labeled ""Outgoing Mail"", Outgoing mail compartment includes the master commercial lock access door (lock included) and cannot be used for mail distribution, Outgoing mail compartment includes a 10-3/4"" H x 3/4"" H mail slot and weather protection hood, Include master commercial lock(s) (with 2 keys), Include factory installed 3/4"" W x 1/4"" D trim and a solid rear cover, Single column, Color: Bronze, SKU: SBRI1833