For metric fits, the ___________________________________ establishes the magnitude of the tolerance zone or the amount of part size variation allowed for both internal and external dimensions.

Tolerance Zone

The acceptable range of deviation from a specified dimension that a part can exhibit and still meet the necessary specifications.

Metric Fits

The standard for sizes and tolerances in metric system used to determine suitable fits between mating components.

Internal Dimensions

Measurements within an object or space, referring to the inner limits or sizes of a cavity or enclosure.