19 Then I inquired carefully concerning the fourth beast; for it was different from the other beasts, exceeding dreadful. Its teeth were of iron, and its claws of brass, devouring, and utterly breaking to pieces, and it trampled the remainder with its feet.
Daniel 7:19 Cross References - CAB
Daniel 2:40-43
40 and a fourth kingdom, which shall be strong as iron: as iron beats to powder and subdues all things, so shall it beat to powder and subdue.
41 And whereas you saw the feet and the toes, partly of clay, and partly of iron, the kingdom shall be divided; yet there shall be in it of the strength of iron, as you saw the iron mixed with the clay.
42 And whereas the toes of the feet were partly of iron and partly of clay, part of the kingdom shall be strong, and part of it shall be broken.
43 Whereas you saw the iron mixed with the clay, they shall be mingled with the seed of men: but they shall not cleave together, as the iron does not mix itself with the clay.
Daniel 7:7
7 After this one I looked, and behold, a fourth beast, dreadful and terrible, and exceedingly strong, and its teeth were of iron; devouring and crushing to atoms, and it trampled the remainder with its feet. And it was altogether different from the beasts that were before it; and it had ten horns.