A cikin yankin gine-ginen tushe da na lantarki, casings na taka muhimmiyar rawa wajen tabbatar da tsauri da aminci a ayyukan tono. Waɗannan tsarin silinda mai ƙarfi ana amfani dasu ne don goyon bayan boreholes a lokacin ayyukan tono, musamman a cikin yanayin ƙasa mai tsananin wahala ko inda ayyukan gudanarwa na ruwan ƙasa suka zama muhimman. Casings na hana rushewar bangon borehole, lallai don samun saukin shigarwa da sauri na sassan tushe na tushe kamar piles da anchors.