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645.5 miligrams is about four-fifths as as a Nail.
In other words, it's 0.82 times the of a Nail, and the of a Nail is 1.2 times that amount.
(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 790 miligrams. Nails have been in use for more than 5,400 years and were ven used as a medium of exchange in ancient times.
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