'Threshing sledges' in the Bible

the people also that were therein, brought he forth, and put them to the saw, and to threshing sledges of iron, and to axes of iron, and made them pass through the brickkiln, and thus used he to do unto all the cities of the sons of Ammon. And David and all the people returned unto Jerusalem.

Then said Araunah unto David, Let my lord the king accept it and cause to ascend what is good in his own eyes, - see! the oxen for the ascending-sacrifice, and the threshing-sledges and ox-yokes for wood.

and, the people that were therein, brought he forth, and cut with the saw and with threshing sledges of iron and with axes, thus also, used David to do unto all the cities of the son of Ammon, - and David and all the people returned to Jerusalem.