Locking Inter-Office Mailbox/Safe. Take 8.5x11" Documents! Indoor and Outdoors! Use also as donation box! Metal with coating, Size: 17 x 3.5 x 12 Inches, Drop slot size: 12 x 1/2 inches, Mailbox has slotted front door; Full piano hinged door, Wafer tumbler lock, 2 keys included; Deters unauthorized access to company mail and posting machine; used for outgoing mail collection, private interoffice memos, diskettes, CD-ROMs and more, also can be used to keep private inter-office correspondence confidential; Mounts securely to any wall or door. Horizontal drilled holes distance is 13.8" (351mm), vertical drilled holes distance is 6.8"(175mm).