OD: 5/8" (16mm). Length: 3 Feet. Wall Thickness: 16 Gauge (1.65mm). HPS 6061 Aluminum Straight Tubing is commonly used in industrial, automotive, marine and aerospace applications. This product is great for custom fabrication projects such as DIY radiator heater cooling systems, coolant hose plumbing, air intakes, turbo intercooler piping setups.