What does it mean that all the metals in Nebuchadnezzar's image are broken together in Daniel 2:35?
The breaking together means the entire sequence of Gentile empires depicted by the metals—Babylon, Medes and Persians, Greeks, Romans, and the revived Roman Empire—is shattered as one at Christ's return, then ground to powder and blown away like chaff.
Les teaches that the huge image Nebuchadnezzar saw was a human likeness made of various metals: the head of gold, chest of silver, belly of brass, legs of iron, and feet and toes of iron mixed with clay. Those metals depict the great Gentile empires—Babylon, Medes and Persians, Greeks, and Romans. The word "until" marks a point in time: a stone cut out without hands, Christ at His second event, smites the image upon its feet, the empire then on the scene, identified as the revived Roman Empire in Western Europe. When He breaks them to pieces, verse 35 shows the iron, clay, brass, silver, and gold are broken together; all the residues of those Gentile empires become like the chaff of the summer threshing floors, ground to powder and blown away. So the whole collective residue of Gentile dominion is destroyed together, not merely the final form.
Then was the iron, the clay, the brass, the silver, and the gold, broken to pieces together, and became like the chaff of the summer threshingfloors; and the wind carried them away, that no place was found for them: and the stone that smote the image became a great mountain, and filled the whole earth.