It is the same as 1.66 cm
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The thickness of a dime.
http://wiki.answers.com/Q/What_does_a_2_mm_diameter_object_look_like"
0.73 mm would be hard to see, anywhere. If you cut up 1 inch into 35 pieces, each piece is about 0.73 mm.
Little tiny box (not hollow) with each side of 14mm
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