Where two fence panels meet you will need to join two posts together, so that Colorbond fence panels can be fitted on either side. To join the posts lay them back to back on the saw horses and clamp them together at both ends, so they are flush. Read the instructions that come with the colorbond posts. It tells you where the screws should be drilled, depending on the length of the post. After joining one side with screws, turn the posts over and fix from the other side.