with DH - Wire Rope Hoist or DK - Chain Hoist 

The single-girder crane offers the advantage of a low deadweight. Low-headroom hoists provide good overall dimensions. Single-girder cranes are designed to be controlled from the floor. 

Longer spans and higher capacity cranes utilize computer-optimized box section girders.  Demag single-girder overhead traveling cranes of this design offer maximum stability with minimum deadweight. This keeps the load on the crane runways low, and a cost-effective design can be selected for the building. They also offer the benefits of an outstanding crane geometry that provides excellent travel characteristics.

And not least: optimum adaptation of the crane to the existing building  thanks to the availability of various crane girder and endtruck connection configurations.