Adjustable Steel Building Column, 3.5" OD, Schedule 40, 4" Adjustment Range Allowable Load Capacity* 31,600 lbs. 4" Adjustment Range Fully assembled, self-contained unit, constructed of high carbon, heavy duty steel Finished with corrosion-resistant powder (exceeds ASTM-B117-85) 3.5" OD 11 Gauge (Swivel Plate on Screw End / Rectangular Plate on Tube End)