Main Category : 4C Series High Security Horizontal Mailboxes - USPS Approved / SUITE B -- SERIES 4C HIGH SECURITY HORIZONTAL MAILBOXES -- 18" HIGH 4C High Security Horizontal H4CBT8-7 7-Tenant Door Unit (Double Column) plus (1) Outgoing Mail Compartment; Unit Size: 18"H x 31.5"W x 17"D Q 1 $570.00; +2 Call 4C High Security Horizontal H4CBT2-3 3-Tenant Door Unit (Double Column) plus (1) 4-High Parcel Locker and (1) Outgoing Mail Compartment; Unit Size: 18"H x 31.5"W x 17"D Q 1 $530.00; +2 Call 4C High Security Horizontal H4CBT6-3 3-Tenant Door Unit (Single Column) plus (1) Outgoing Mail Compartment; Unit Size: 18"H x 17"W x 17"D Q 1 $346.00; +2 Call 4C High Security Horizontal H4CBT10 Parcel Locker 1-Door Compartment (4-High) Single Column; Unit Size: 18"H x 17"W x 17"D Q 1 $277.00; +2 Call 4C High Security Horizontal H4CBT10-2 Parcel Locker 2-Door Compartment (4-High) Double Column; Unit Size: 18"H x 31.5"W x 17"D Q 1 $506.00; +2 Call 4C High Security Horizontal H4CB2XL 4-Tenant Door Combo Unit, Double Column, including (2) Standard Size Doors, (2) X-Large Doors and (1) Outgoing Mail Compartment; Unit Size: 18"H x 31.5"W x 17"D Q 1 $599.00; +2 Call 4C High Security Horizontal Surface Mount Collar H4CB1SM Surface Mount Collar for 4C Suite B Mailbox (single column unit Q 1 $258.00 ; +2 Call 4C High Security Horizontal Surface Mount Collar H4CB2SM Surface Mount Collar for 4C Suite B Mailbox (double column unit) Q 1 $286.00; +2 Call