The M1-LT Mailbox is the smallest mailbox from Fort Knox, and also the thinnest in their line, but it's still thicker than all other locking mailboxes on the market.
Specifications:
Exterior Dimensions: 10.25"H x 10"W x 20"D
Body Thickness: 1/8"
Door Thickness: 1/8"
Weight: 38 lbs
Hand welded (no spot welds or rivets)
1" continuous welded steel hinge
Features:
1 3/4" x 10" incoming mail slot
7 pin tubular lock
7 1/2" recessed slot designed to accept small packages while keeping hands out