'Spear' in the Bible

This is the list of David's men of war: Ishbaal, the son of a Hachmonite, the chief of the three: he put to death three hundred at one time with his spear.

And Abishai, the brother of Joab, was chief of the thirty, for he put to death three hundred with his spear, but he had not a name among the three.

And he made an attack on an Egyptian, a very tall man about five cubits high, armed with a spear like a cloth-worker's rod; he went down to him with a stick, and pulling his spear out of the hand of the Egyptian, put him to death with that same spear.

And again there was war with the Philistines; and Elhanan, the son of Jair, put to death Lahmi, the brother of Goliath the Gittite, the stem of whose spear was like a cloth-worker's rod.