What happens to the four metal parts of Nebuchadnezzar's image when the stone strikes them?
When the stone strikes the image's feet of iron and clay, the image tips over, and the stone rolls over all the metals—iron, brass, silver, and gold. They are broken to pieces, crushed, and become like chaff, powder, and dust that the wind carries away, leaving no place for them.
Les explains that the stone cut out without hands strikes the image upon its feet of iron and clay. Because the image is top-heavy, it tips right over, and the stone rolls over all the metals like a steamroller building a highway. It breaks and crushes the iron and clay feet to pieces, then moves on up over the iron legs, the brass, the silver, and the gold. These metals become like chaff, powder, and dust, and the wind carries them away so that no place is found for them. The stone that destroyed the image then becomes a great mountain, which Les identifies as a kingdom, most generally the kingdom.