Rolling mills

A stretch-reducing rolling mill for optionally producing tubes having a final circular or angular cross-sectional configuration, comprising a plurality of driven roll stands arranged in stand holders one behind the other in the rolling direction, said roll stands and holders being divided into a first and a second group in which rolling mill the second stand holders are last in the rolling direction and are spaced sufficiently apart for them to be selectively equipped with three-roller or four-roller stands, and in which the first or front stand holders cannot be selectively so equipped but are equipped exclusively with three-roller stands, said front stand holders being spaced at distances apart too close for four-roller stands but adapted to the three-roller stands, said front holders being provided with a group drive, and said last stand holders, which may be equipped selectively with three-roller or four-roller stands, being provided with a separate drive independent of the group drive of the front stand holders.