Correction for the size of a Nailhead
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How big is 30 square centimeters?
It's about forty times as big as a Nailhead
The size of a Nailhead is about 0.77740 square centimeters.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 0.7774 sq. cm (0.1205 sq. in). Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.