A pin head.
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Approximately 1 mm is about the size of a grain of sand or the thickness of a credit card.
approximately 12.7 mm
a flea or a crumb could be a millimeter. A US dime is 1.35 mm thick, and a penny is 1.55 mm thick. See related link
It is, in fact, 1.75 mm thick, not 2 mm. So any reasons which tried to explain why it is 2 mm thick would be contradicted by reality!
.075 inches is equivalent to 75 thousandths of an inch. In millimeters, this thickness is approximately 1.91 mm. To visualize it, it's slightly thicker than a credit card, which is typically around 0.03 inches (0.76 mm) thick.
The length would be 5.98 inches.