Two posts can easily be joined through bolts and nuts using the 3/8 inch pre-drilled holes located at every 1 inch on the center of the U-channel post. All you have to do is lay the second post on the ground near to the first post that is buried in the ground. Align the posts so that they will nest. Thread one bolt through both posts. Then swing up the second post vertically and, on the top of the overlap, tighten the second bolt.