Nyongolotsi ndi tsinde la cylindrical, la ulusi lomwe limadulidwa pamwamba pake. Giya ya nyongolotsi ndi gudumu lokhala ndi mano lomwe limalumikizana ndi nyongolotsi, kutembenuza mayendedwe ozungulira a nyongolotsi kukhala kuyenda kwa mzere wa giya. Mano pa giya nyongolotsi amadulidwa pa ngodya yomwe ikugwirizana ndi ngodya ya helical groove pa nyongolotsi.
Mu makina amphero, nyongolotsi ndi nyongolotsi zimagwiritsidwa ntchito kuwongolera kusuntha kwa mutu wamphero kapena tebulo. Nyongolotsi nthawi zambiri imayendetsedwa ndi mota, ndipo ikazungulira, imalumikizana ndi mano a nyongolotsi, zomwe zimapangitsa kuti zida ziyende. Kusunthaku kumakhala kolondola kwambiri, kulola kuyika bwino mutu wa mphero kapena tebulo.
Ubwino umodzi wogwiritsa ntchito nyongolotsi ndi nyongolotsi pamakina ogaya ndikuti umapereka mwayi wamakina apamwamba, kulola kuti injini yaying'ono kuyendetsa nyongolotsiyo ikugwirabe bwino. Kuphatikiza apo, chifukwa mano a giya ya nyongolotsi amalumikizana ndi nyongolotsi pamtunda wosazama, kugundana kumachepa komanso kuvala pazigawo zake, zomwe zimapangitsa moyo wautali wautumiki wadongosolo.
