Are you still talking about 'knockouts'? If so, what are those figures if not diameters?
True, but that includes an implicit assumption about 'shape' (ratio of width to depth),which would not be applicable to those 'knockouts' in the sides of 'dry lining boxes'
It was, and one differences which secure suggested was (as I understand it) that 47mm ones might have "25mm knockouts", whereas less deep ones may/do not.
How come?
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