HPS (AST-200) 2" OD x 1' Long 16-Gauge 6061-T6 Aluminum Straight Tubing Material: 6061-T6 aluminum 16 Gauge. Wall Thickness: 0.065" Tubing outside diameter: 2 inch (51mm) Length: 12 inch Commonly used in industrial, automotive, marine and aerospace industry; Great for custom fabrication project such as DIY air intake, cooling systems, turbo intercooler piping