'Hand mill' in the Bible

No man shall take the hand-mill or the upper millstone in pledge; for it would be taking life in pledge.

Who smote Abimelech the son of Jerubbesheth? did not a woman cast the upper stone of a handmill from the wall, that he died in Thebez? why did ye go near the wall? then say thou, Thy servant Urijah the Hittite is dead also.