System to roll at least two sections in blocks of fast rolling mill stands

System to roll at least two sections comprising a plurality of blocks of fast rolling mill stands arranged along a rolling axis, each fast rolling mill stand including one pair of rolling rolls supported as cantilevers, the respective fast rolling mill stands having alternately along said rolling axis rolling rolls having a horizontal axis and a vertical axis, the rolling rolls having a diameter between 160 and 250 mm. and a distance between 600 and 1200 mm. between the center of one pair and the center of the next pair of rolls, respective alternate rolling rolls defining a vertical plane substantially intermediate between the respective rolling rolls having a vertical axis and a horizontal plane substantially intermediate between the respective rolling rolls having a horizontal axis, the rolling axis being defined by an intersection of the vertical axis and the horizontal axis and being intermediate between the sections, the system further comprising, in cooperation with the respective pairs of rolling rolls of two blocks of fast rolling mill stands, a first guide box for round sections which is positioned upstream of a first pair of rolling rolls, a second guide box which receives oval sections and displaces at least partly at least two sections from a first rolling plane of the first pair of rolling rolls to a second plane perpendicular to the first rolling plane, a third guide box with rolls which receives oval sections and aligns the same on the second rolling plane of a second pair of rolling rolls and a fourth guide box which receives round sections and displaces the sections at least partly from the second rolling plane of the second pair of rolling rolls to the first plane perpendicular to the second plane, the fourth guide box being followed by a fifth box which aligns the round sections on the first plane, the second, third and fourth guide boxes displacing the sections without changing a circumferential position of axes of sections in relation to the horizontal.