Standard for API SPEC 5CT, API SPEC 5B, ISO11960 tubing Application: Ana amfani da shi don ɗaukar ɗanyen mai da iskar gas daga samuwar mai da iskar gas zuwa saman bayan an gama hakowa wanda aka ƙera don jure matsin lamba da aka haifar yayin hakar ma'adinai kuma yana da diamita na waje.2-3/8” zuwa 4-1/2.
Aikace-aikacen casing: amfani da ganuwar mai da gas Wells.sizes:4-1/2”—20”
Babban maki na karfe bututu: J55, K55, N80-1 N80-Q