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.   DURABLE CONSTRUCTION: Made from high-quality weather-resistant material to withstand outdoor elements and maintain structural integrity 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 DIMENSIONS: Standard size mounting board accommodates most residential mailbox models while providing a clean, finished appearance CLEAN APPEARANCE: Crisp white finish complements any mailbox style and maintains a professional look while protecting the mounting area NOTE : Our mailbox mounting bracket is not suitable for all mailbox sizes.Please confirm if the size is suitable before purchasing Transform your mailbox installation with this versatile white mounting board adapter plate. Designed specifically for metal posts, this mounting board provides a secure and stable foundation for your mailbox. The adapter plate offers a clean, professional look while ensuring proper alignment and support. Its durable construction withstands outdoor elements, making it a reliable solution for both residential and commercial applications. The mounting board's white finish complements various mailbox styles and maintains a neat appearance over time. Installation is straightforward, allowing you to attach your mailbox securely to metal posts. This practical hardware solution eliminates common mounting challenges and creates a solid connection between your mailbox and post. Perfect for new installations or upgrading existing setups, this mounting board helps maintain proper mailbox positioning and stability.