Aluminum Round Tube 6061, Aluminum, 6061, T6, Round Tube, 12 in Overall Length, Outside Diameter 9 in, Inside Diameter 8 in, 0.5 in Wall Thickness, Fabrication Extruded, Heat Treatable Yes, Mechanical Finish Mill, Yield Strength 40,000 psi, Tensile Strength 45,000 psi, 95 Brinell Hardness, 60 Rockwell Hardness, Includes Material Certificate Yes, Standards AMS QQ-A-200/8, System of Measurement Inch