GBM ni ubwoko bwo guswera ubwoko bwimashini isenya imashini ikoresheje icyuma gikoreshwa cyane mu nganda zihanamiye.
Nubwoko bugenda hamwe nisahani hamwe numuvuduko mwinshi hafi ya metero 1.5-2.8 kuri min. Hamwe na moderi GBM-6D, GBM-6D-T, GBM-DBM-R, 15D-8D-R kumahitamo hamwe nimpapuro nyinshi zubwoko bwicyuma.
