'Weaver's' in the Bible

He killed an Egyptian, a man of great stature five cubits tall. Now in the Egyptian’s hand was a spear like a weaver’s beam, but he went down to him with a club and snatched the spear from the Egyptian’s hand and killed him with his own spear.

And there was war with the Philistines again, and Elhanan the son of Jair killed Lahmi the brother of Goliath the Gittite, the shaft of whose spear was like a weaver’s beam.