Telescopic boom ndi chowonjezera chofala pamakina aukadaulo, omwe angagwiritsidwe ntchito pokumba, zonyamula katundu, ma cranes ndi zida zina.Ntchito yake yayikulu ndikukulitsa utali wozungulira wa zida, kukonza magwiridwe antchito komanso kusinthasintha kwa zida.
Excavator hayidiroliki telescopic boom amagawidwa kunja telescopic boom ndi mkati telescopic boom, kunja telescopic boom amatchedwanso kutsetsereka boom, telescopic sitiroko mkati mamita anayi;mkati telescopic boom amatchedwanso mbiya boom, telescopic sitiroko akhoza kufika mamita oposa khumi kapena mamita makumi awiri.