Washers zvinhu zvakakosha zvinoshandiswa mumhando dzakasiyana-siyana dzemaindasitiri uye zvikumbiro zvekugovera mutoro, kudzivirira kusunungura, uye kupa nzvimbo yakatsetseka kune fasteners.Neanopfuura makore makumi matatu echiitiko, tinodada nekuve vanotungamira mugadziri wemawashi emhando yepamusoro.