office mail slot | office mail slot

Antique Vintage Solid Brass LETTER Mail Slot Hardware Post Office.

This item: DEAYOU Locking Mailbox Wall Mounted, Drop Box with Key Lock, Weatherproof Secure Mail Box, Galvanized Steel Cover Metal Dropbox with Slot for Envelope, Letter, Outside, Home, Office Business, White.

A thin opening or groove in something is a slot. You can put letters and postcards through the mail slot at the post office.