CNC Machined 5 bolt flange for T3 turbine with External wastegate use. Improved to include the 3 bolt pattern tapped into so that the 3 bolt downpipe (same as one used on internal WG) can bolt directly to it. Otherwise, it works as a standard weld flange like usual. The diameter of the circle is 2.375". 1/2" Thick material. Very durable!