This product can be used to attach any one of our post mount mailboxes to a wooden 4×4 post. The adapter also includes many common top and side bolt patterns to be used with other mailbox brands, including the common 11-1/4″ side flange mount screw pattern. This adapter can be installed onto a wooden post as a top mount, side rail mount and front cantilever mount to suit your needs. The Adapter is generally hidden from view after installation.