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Raceworks Donuts are Tight Radius 5052 Grade aluminium, and welded on the outside only
They all feature a 41mm dia hole in the centre

Tube dia. Imperial Tube dia. Metric Part No. Wall Thickness Centre Line Radius Bead Rolled Finish
2.0″ 50.8mm ITD-200 2.0mm 45.9mm No Raw
2.5″ 62.0mm ITD-250 2.0mm 51.5mm No Raw
3.0″ 76.0mm ITD-300 2.0mm 58.5mm No Raw
3.5″ 89.0mm ITD-350 2.0mm 65.0mm No Raw
4.0″ 101.0mm ITD-400 2.0mm 71.0mm No Raw
5.0″ 127.0mm ITD-500 2.0mm 85.0mm No Raw