Meet the Post Anchor Kit, your shortcut to a sturdy, no-stress mailbox post setup. This smart mailbox accessory is designed for quick, no-dig installation of popular plastic mailbox and post combinations that fit over a 4x4 post. The included steel drive-in anchor does all the heavy lifting, creating a secure base without the hassle of concrete or digging. If you're installing a slip-over post or slip-over mailbox and post kit, this handy mailbox anchor post kit keeps your setup sturdy, and standing tall. Because great mailbox parts should make installation simple and your curb appeal even better.