An ordinary pencil is one example.
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A cent (penny) is circular so the "greatest distance" is simply its diameter. Since 1858, all US cents have had a diameter of 19.05 mm.
d = 2r = 12 mm
6mm = 6/1 mm.
A diameter of 6 mm is equivalent to 0.24 inches. To visualize it, it's slightly larger than the size of a standard pencil lead or the width of a small bead. In everyday terms, it's about the size of a pea or a small marble.
6mm means 0.006m or 0.6 cm