The Aluminum Round Tube 6061 is an industry-standard heat-treatable structural alloy, designed to provide strength, corrosion resistance, and hardness. It features an Outside Diameter of 3/8in and an Inside Diameter of 0.277in, along with a 12 in Overall Length. It also holds a 0.049in Wall Thickness with a /-0.003in tolerance, and is tempered with a F85 Rockwell Hardness. ASTM B221 Standards compliant.