... Application: serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, , ... Application: serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, ... : serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, ... : serves as walls of a well .Packing: bundle or bulk Material grade: J55, K55, N80, L80, T95, ...