They are manufactured in 1, 2, 3 or 4 ( with pre-reduction gear ) reduction steps, for input power from 0,7 kW up to approx. 9300 kW. The available output torque goes from 1400 Nm up to 692.000 Nm, with cast iron or fabricated steel housing , according to the different sizes. The gearboxes can be delivered either with coupling flange to motors , direct or through coupling device, or with input shaft , and the output shaft can be hollow type or solid type , single or double.