... Description 4 1/2" oil casing Casing and Tubing Standard: API 5CT,Carbon Steel4 1/2"Lu ye30MeterLength: R2, R3 ... N80, L80, T95, , 5" oil casing pipeCasing and Tubing Standard: API 5CT,Carbon Steel5"LUYE30MeterLength: R2, R3.Application: serves as walls ... K55, N80, L80, T95, 7" casing pipeCasing and Tubing Standard: API 5CT,Carbon Steel7"LUYE30MeterLength: R2, R3.Application: serves as walls ...