Here is another for all you spanner benders. The biggest bolt ever made was in 1967 by the Penrith Engineering Works company in Scotland. They were enormous - 27.4' long (8.3m), 4.2' diameter (1.27m), weighing 12.6 tonnes. I would love to see the spanner for those monsters. For sure you won't find one that size at Home Depot. And if you did the nuts wouldn't fit properly. I'm not sure the picture is of the same bolts.