Correction for the size of a Nailhead
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How big is 251.90 square millimeters?
It's about three times as big as a Nailhead
The size of a Nailhead is about 77.740 square millimeters.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 77.740 square millimeters. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.