וְאֶת־הָעָ֨ם אֲשֶׁר־בָּ֜הּ הוֹצִ֗יא וַיָּ֣שֶׂם בַּ֠מְּגֵרָה וּבַחֲרִצֵ֨י הַבַּרְזֶ֜ל וּֽבְמַגְזְרֹ֣ת הַבַּרְזֶ֗ל וְהֶעֱבִ֤יר אוֹתָם֙ במלכן [בַּמַּלְבֵּ֔ן] וְכֵ֣ן יַעֲשֶׂ֔ה לְכֹ֖ל עָרֵ֣י בְנֵֽי־עַמּ֑וֹן וַיָּ֧שָׁב דָּוִ֛ד וְכָל־הָעָ֖ם יְרוּשָׁלִָֽם׃ (פ)
And he brought forth the people that were therein, and put them under saws, and under harrows of iron, and under axes of iron, and made them pass through the brickkiln; and thus did he unto all the cities of the children of Ammon. And David and all the people returned unto Jerusalem.
Rashi on II Samuel
Saw-like utensils, iron threshing utensils and iron axes. They are types of tortures.
Rashi on II Samuel
Saw-like utensils. A knife serrated with many [sharp] edges bent towards each other.
Rashi on II Samuel
Threshing utensils. This is a hacked saw full of cuts like "many sharp edges"12Shmuel I, 13:21. that is called laime (O.F.).