Nhungamiro mbirizvishandiso zvehonye uye vhiri rehonye rudzi rwegiya rinoshandiswa kutumira simba. Rine honye, inova chinhu chakaita sesikuruu chine mazino akatenderera, uye vhiri rehonye, inova giya rine mazino akabatana nehonye.
Izwi rekuti dual lead rinoreva kuti gonye rine mazino maviri, kana kuti shinda, dzinotenderedza silinda nemakona akasiyana. Dhizaini iyi inopa giya rakawanda zvichienzaniswa negonye rimwe chete, zvinoreva kuti vhiri regonye richatenderera kakawanda pakuchinja kwegonye.
Chakanakira kushandisa vhiri remagonyeti maviri neremagonyeti ndechekuti rinogona kuwana giya rakakura muchimiro chakabatana, zvichiita kuti rive rinobatsira mukushandiswa uko nzvimbo iri shoma. Rinozvivharirawo roga, zvichireva kuti gonye rinogona kubata vhiri remagonyeti panzvimbo pasina chikonzero chekushandisa bhureki kana imwe nzira yekukiya.
Masisitimu maviri emota ine tambo mbiri (dual lead worm) nemavhiri emota (worm wheel) anowanzo shandiswa mumichina nemidziyo yakaita sema conveyor system, michina yekusimudza, uye maturusi emuchina.