“Gauge” is a relative measurement, specific for each item. Some items measure relative thickness (roofing sheets, steel sheets), relative diameter (wire, pipes) etc etc. For example, gauge-24 roofing-sheets are pretty thick (and inflexible/stiff), gauge-30 are much, much thinner than the 24, and gauge-32 get thinner and very flexible. It is not an exact measurement “unit” per-se.
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