MSL Mail Slots
This is a mail slot sleeve is constructed from stainless steel. It lines the cutout in your door that receives mail. The sleeve is designed for through door mail slots that are 11-1/2 in.
Amazon.com: KYODOLED Suggestion Box with Lock and Slot, Small ...
Plugsharge Locking Door Drop Box with Combination Lock – Steel Mailbox with Rear Access, Mail Slot for Rent, Deposit, Night Key, and Mail – Through-Door Design Prevents Money Fishing, Durable Black.
Brass Mail Slots | eBay
Antique Victorian Solid Brass Bronze Door Mail Letter Slot Spring Loaded Fine. ... Original British Art Deco C1925 Stepped Design Door Knocker With Mail Slot.