The ultimate square post goes by a few names.  Most commonly it is called a Unistrut, but that's really just a brand name.  This post is primarily used for sign display.  It has holes that run all the way up for variable sign placement.  It is a 2" square post that is galvanized steel to prevent rust or decay, and it is Schedule 40.  We carry the anchor and the sleeve that go with it.  The anchor and sleeve help make it easy to replace the post and keep it from being damaged if it is hit by a vehicle.  Usually two to four jumbo rivets are used at the base to secure the anchor, sleeve, and post.  You simply hammer these in and they are a permanent installation that cannot be removed.  You use these same rivets to secure the sign.  The jumbo rivets make the sign and post difficult to steal since there is no nut that can be removed.  The rivets have to be drilled out to be replaced.  We are proud to offer our customers this post in a variety of lengths.  We can even have the posts powder coated certain colors as many counties require that.  We look forward to your inquiry about the ultimate square post also known as the Unistrut post.