What are screws most commonly made of?
Screw
While a recent hypothesis attributes the Archimedes' screw to Sennacherib, King of Assyria, archaeological finds and pictorial evidence only appear in the Hellenistic period and the standard view holds the device to be a Greek invention, most probably by the 3rd century BC polymath Archimedes.[60]  Though resembling a screw, this is not a screw in the usual sense of the word.