Booms are the part on which the load is moved back and forth with a roller system called a trolley. The boom length represents the working area of ​​the tower crane. In order to facilitate transportation, manufacturability and assembly, the booms are produced module-module and then attached to each other and assembled.

The boom length is determined according to the status of the project. Considering the lifting capacities of the tower cranes at the end, the distance of the weight to be carried and the carrying area determines the boom length and can be extended or shortened if desired.