'Threshing sledges' in the Bible

He also brought out the people who were there, and put them to [work with] the saws and sharp iron instruments and iron axes, and made them work at the brickkiln. And he did this to all the Ammonite cities. Then David and all the men returned to Jerusalem.

Ornan said to David, “Take it for yourself; and let my lord the king do what is good in his eyes. See, I will give you the oxen also for burnt offerings and the threshing sledges (heavy wooden platforms) for wood and the wheat for the grain offering; I give it all.”