Large cable trolleys for I-beam are made for special projects. Large cable trolleys can have saddles from 160 till 460 mm diameters. Maximum cable trolleys are produced for moving cables weighing 550 kg. Trolley has weight 120 kg. Few saddles allow isolating power cables and controlling cables. Saddle diameters depend on cable diameters and their bents. If necessary cable trolleys are manufactured with three pairs of rollers. Diameter and type of rollers are chosen depending on dimension and type of I-beam.