21. These are the horns—rather, Those, namely, the horns being distinguished from the "carpenters," or destroying workmen ("skilful to destroy," Ex 21:31), intended in the "these" of the question.
no man … lift up his head—so depressed were they with a heavy weight of evils (Job 10:15).
to fray—to strike terror into them (Eze 30:9).
lifted up … horn—in the haughtiness of conscious strength (Ps 75:4, 5) tyrannizing over Judah (Eze 34:21).