Our selection of locking cluster mailboxes are specifically designed for apartments, multi-family residence, or neighborhoods looking to enhance the look of their residences by reducing the number of individual mailboxes per street. These cluster box units are for both commercial and residential use and have as many as 16 individual boxes per unit. Each Cluster Box Unit (CBU) includes both an outgoing mail receptacle and a parcel compartment for larger packages. These CBU’s are weather resistant and approved by the US Postal Service. Free Ground shipping in the contiguous 48 United States for orders over $100.