hese adjustable building columns are fully assembled and self-contained. 3 in. 11 gauge steel, adjusts from 9 ft. 9 in. to 10 ft. They are also corrosion-resistant thanks to a powder coating. Designed to be a permanent building column, they are constructed of durable steel for safety and stability and come fully assembled with no loose parts. We have 3 of these adjustable columns left. They are barely used and in excellent condition. The screw on the end is missing on these, but you can purchase the screws from hardware companies that sell similar posts.