Five
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A o.7 mechanical pencil will do the job.
The "number 2" designation refers to the "hardness" of the lead. The higher the number, the "harder" The "7mm" designation refers to the "thickness" of the lead. The higher the number, the thicker. They are not the same pencil.
7
a pencil is 7 1/4 inches long with out a rubber on it
About 7 3/4 inches.