Many different size nails have 'ribs' on them.
They are to make it harder for the nail to be pulled out.
A 'spiral' ( ardox ) nail is even harder to pull out.
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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!).
A dime, a nickel, and a penny (10 cents plus 5 cents plus 1 cent = 16 cents)
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The words cent and penny are synonymous; a cent is a penny.