KOMOHOM mailbox mounting plate is made of high-quality cold-rolled steel with a thickness of 4mm. It is 266% of the thickness of the others 1.5mm thick bracket，It can not only serve as a carrier for connecting the mailbox to the column but also play a role in reinforcing the mailbox.   Mailbox Mounting Board Widely applicable: Suitable for most residential and commercial email installations, providing reliable installation bases and reinforcement solutions. Secure Mounting: Designed for mounting mailboxes securely onto posts or walls, ensuring a sturdy and long-lasting installation.(NOTE:Not suitable for mailboxes without bottom mounting holes.) Mailbox Bracket Easy Installation: With its straightforward design, this bracket allows for hassle-free installation and setup.Suitable Mailbox Hole Size: 10"x4"; 5"x5"; 7"x3-1/4”； 3-1/4"x3-1/4";Mounting hardware included Durable Construction: Crafted from high-quality materials, this mounting bracket offers long-lasting performance and resistance against harsh weather conditions. NOTE : Our mailbox mounting bracket is not suitable for all mailbox sizes.Please confirm if the size is suitable before purchasing Mailbox Mounting Bracket,Upgrade your mailbox with this sturdy mounting bracket, board, or plate designed for compatibility with popular brands like Mail Boss, ARCHITECTURAL MAILBOXES, Gibraltar Mailboxes, hykolity, ShoppingOnBed, and adoorn Post Mount Mailboxes. Crafted to securely hold your mailbox in place on a post, this mounting accessory ensures your mail is delivered safely and conveniently. With its durable construction and easy installation, this bracket, board, or plate is an essential addition for any homeowner seeking a reliable mailbox setup. Dimensions and hardware may vary by manufacturer, so please refer to the product details for exact specifications.