The USPS approved Mail Boss High-Security Locking post-mounted mailbox delivers unrivaled security and protection against mail theft, identity theft, and vandalism, an affordable virtually impenetrable security locking mailbox available. Mail Boss High-Security Mailbox Features: U.S. Post Master Approved for curbside delivery Full service, large capacity curbside locking security mailbox 12 & 14 Gauge electro-galvanized welded steel Incoming mail slot accepts a box of checks Ð 1.9_ H x 10.25_ W Stainless steel hinges for ease of use 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 Durable powder-coated finish Models Compared: Mailbox Package Master View Here Mail Boss Mail Manager View Here Mounting Options Post w/ fast track mounting bracket Post w/ fast track mounting bracket Post with universal hole pattern Mail Shield/baffle door Technology Yes No Yes Outdoor Mounting Yes Yes Yes Steel Gauge 12 and 14 gauge 12 and 14 gauge 14 and 16 gauge USPS Approved Yes Yes Yes Accepts small packages Yes No Yes Max mail / package size 4.5"h x 4.5"w x 10.5”l 1.9"h x 10.25"w 3.5"h x 10.2"w Package Examples Legal-size envelopes, mail bundles etc... box of cheques mail bundles, prescriptions, magazines Mail Storage Capacity 7-10 days 1-2 weeks 3-7 days Access Type Front Front Front (rear access available on Street Safe latitude model only) Plastic Floor Liner Yes Yes No Dimensions H 16" x W 12" x D 21.5" H 13.25" x W 11.25" x D 21" H 11.25" x W 10.75" x D 21" Included in the Box: QTY Item Link 1 Mail Boss Ultimate High-Security Locking Mailbox 1 Fast Track bracket mounting system 1 Vandal Resistant Flag 1 3 Keys 1 Reflective Numbers 1 All Hardware Required for Installation Optional In-Ground / Surface Mount Post In-Ground / Surace Mount Dimensions: Mailbox Height (inches) Width (inches) Depth (inches) Mailbox 13.25" 11.25" 21" In-Ground Post 43" 4" 4" Surface Mount Post 27" 4" 4"