Main Category : Commercial Mailboxes / 4C High Security Horizontal Mailboxes – USPS Approved / 4C Horizontal Mailbox Accessories HK91910 Replacement 4C Tenant Lock with Three Keys HK91910 Replacement 4C Tenant Lock with Three Keys Packed two per box; price per box. Qty. 1-5: $29.90/box; Qty. 6+ Call HK4CPLock Private Master 4C Lock with Three Keys HK4CPLock Private Master 4C Lock with Three Keys For Private Use/Access Only Qty. 1-5: $24.95 ea.; Qty. 6+ Call H91512 Key Blanks for 4C Mailboxes H91512 Key Blanks for 4C Mailboxes Packed 25 per box; Price per box Qty. 1-5: $29.95/box.; Qty. 6+ Call H91514 Number Plates – Metal Adhesive with Black Lettering H91514 Number Plates – Metal Adhesive with Black Lettering Up to 7 Digits. Specify Number or Numbers when Ordering. Qty. 1-5: $.99 ea.; Qty. 6+ Call HKL91111SP Replacement 4C Tenant Door with Lock HKL91111SP Replacement 4C Tenant Door with Lock Size 3"H x 12.875"H; Includes three keys. Qty. 1-5: $29.95 ea.; Qty. 6+ Call