... serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, , 5" oil ... serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, 5 1/2 ... serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, 6 5/8 ... serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, 7" casing ...