I-Telescopic boom iyisesekeli esivamile semishini yobunjiniyela, engasetshenziswa kuma-excavators, ama-loaders, ama-cranes nezinye izinto zokusebenza.Umsebenzi wayo oyinhloko ukunweba indawo yokusebenza yemishini, ukuthuthukisa ukusebenza kahle komsebenzi kanye nokuguquguquka kwemishini.
I-Excavator hydraulic telescopic boom ihlukaniswe yaba yi-boom yangaphandle ye-telescopic kanye ne-boom yangaphakathi ye-telescopic, i-boom yangaphandle ye-telescopic ibizwa nangokuthi i-sliding boom, i-telescopic stroke phakathi kwamamitha amane;i-telescopic boom yangaphakathi ibizwa nangokuthi i-barrel boom, unhlangothi lwe-telescopic lungafinyelela ngaphezu kwamamitha ayishumi noma amamitha angamashumi amabili.