This stairway is 60" in diameter, has a multi level staircase, and rest landings that are 90 degree circular. The handrail is a #200 (1 1/2" round) steel tubing; balusters are a # 302   (1" square) tubing; one per tread. The treads are # 100 (12 gauge) smooth steel with a 2" by 2" taper. The center column is a 3 1/2" round schedule 40 pipe. The finish on the stair is a primer gray applied at the plant.