Inner diameter
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Inner diameter or internal diameter (in tube bending technology also called as I.D.) of the tube is main distance between 2 opposite endpoints inside the tube.
The main calculation of tube inner diameter:
I.D. = O.D. - 2 x W.T.
Where I.D. is inner diameter, O.D. is outer diameter and W.T. is wall thickness
For example tube with I.D. of tube with O.D. 16 mm and W.T. 1 mm will be 14 mm which means =16 mm - 2x1 mm

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