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Internal diameter.
An internal caliper gauge.
A meter rod may not fit cross-wise inside a breaker (whatever that is).
The diameter is the measurement of a line that goes right through a circle, through the centre point. In cases where we have a ring or some other such object with multiple circles, we would have an external diameter and an internal diameter. The internal diameter is the diameter of the inner circle. The external diameter is the diameter of the outer circle.
The radius of a circle is half the diameter.