The 2 mm is the choice for architects, because it is not as thin as the 0.5 (a technical pencil) or a 4.5 (a sketching pencil that brings not enough definition), the 2 mm for architects is the right spot where the tool allows for an expressive drawing while keeping a decent amount of precision on it. It is also quite poor that the 2 mm mechanical pencil replaces the same size of a traditional wooden pencil. However it is the most uncommon size to find.
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