8d (eight penny) nails are made from 10 1/4 gauge (oh how I detest those English/American standards!) steel wire.
10 1/4 gauge wire has a diameter of 0.131 inches or 3.33 millimeters (metric - I can relate to that!).
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An 8 penny nail (abbreviated as 8d) is 2.5 inches in length. A 10 penny nail (10d) is 3 inches in length.
The diameter of a US penny is 0.01905 metres
A US copper penny is exactly 2 cm wide.
The size of the penny is very important. The weight of it is 2.500 grams exactly. The diameter is 0.750 inches or 19.05 mm or 1.905 centimeters.
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