Finally, there will be a fourth kingdom as strong as iron; for iron shatters and crushes all things, and like iron that crushes all things, it will shatter and crush all the others.
KJV
And the fourth kingdom shall be strong as iron: forasmuch as iron breaketh in pieces and subdueth all [things]: and as iron that breaketh all these, shall it break in pieces and bruise.
ASV
And the fourth kingdom shall be strong as iron, forasmuch as iron breaketh in pieces and subdueth all things; and as iron that crusheth all these, shall it break in pieces and crush.