... tower cranes, top less tower cranes,inner climing tower crane specialized in producing and exporting various tower cranes, top ... less tower cranes..Tower crane: type QTZ31.5, QTZ40, QTZ 63, QTZ80, QTZ125, ... single cage, double cage of 1-ton lifting capacity and 2-ton lifting capacity at present. The types are as ... 90S,HBT80-13-110s,HBT80-16-90s 20T tower crane