A jerin rebar baka lankwasawa inji ne mu kamfanin tsara musamman kayan aiki ga manyan-sikelin yi ayyukan, gadoji, tunnels, culverts, wutar lantarki tashoshin da jirgin karkashin kasa ayyukan da dai sauransu . gudun, daidai baka, da gyare-gyaren lokaci guda.