There are four type of posts available for MetalWorks Excalibur® Steel Railing: end, mid (line), corner and blank. The end, mid and corner posts are preassembled for applications with either a 2” or 4” bottom space. End, mid and corner posts come standard in both 2” and 3” square steel posts that include pre-attached level brackets, pre-attached aluminum post caps, bracket covers, leveling shims and a two-piece trim ring.