With heavy-gauge galvanized welded steel construction and stainless steel hinges. The Mail Boss is a Postmaster General Approved mail fortress ! An exclusive patented anti-pry latch locking mechanism prevents leveraged entry, so unlike other locking mailboxes, the Mail Boss can’t be easily pried open by would-be identity thieves. With the patented Fast-Trak® Mounting Plate, you can quickly and easily install your high-security mailbox on an existing post, platform or gang plank. U.S. Post Master Approved Full service, large capacity curbside locking security mailbox 12-& 14-Gauge electro galvanized welded steel Incoming mail slot accepts a box of checks – 1.9" H x 10.25" W Patented anti-pry latch locking mechanism to prevent leveraged entry Locking access door with commercial grade high-security wafer lock Patented Fast-Trak Mounting Plate for quick installation Stainless steel hinges for ease of use Includes vandal resistant flag, 3 keys, reflective house numbers