Telespar® posts consist of a square, perforated, welded steel tubing, in various sizes and gauges. Holes on all four sides allow you to mount signs on all four sides of the post. The Tippmann Propane Hammer will drive your Telespar® posts in a matter of seconds. We manufacturer a full line of Telespar® adapters for driving any size and wall thickness up to 2.5" square.