GBM ni imashini yo gukata ibyuma ikoresha icyuma gikata ikoreshwa cyane mu nganda zikora ibyuma.
Ifite ubwoko bw'amaguru hamwe n'inkombe z'icyuma zifite umuvuduko wo hejuru wa metero 1.5-2.8 ku munota. Ifite ubwoko bwa GBM-6D, GBM-6D-T,GBM-12D, GBM-12D-R,GBM-16D na GBM-16D-R kugira ngo ikoreshwe mu buryo butandukanye ku bwoko butandukanye bw'icyuma.
