High quality aerospace aluminium (6061-T6) AN6 Male hardline tube fitting-5/16"(8mm) This fitting provides the maximum seal that can be achieved allowing for better flow and performance. Ideal to convert your OEM fuel lines to a AN6 Male thread. CNC machined to exact tolerances for a perfect fitting. For use on 5/16" (8mm) Hardline tubing Anodized Aluminium - Black(we can supply other color too, please contact me) Brass olive supplied.sell 1piece per order.