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Drilling Casing pipe API SPEC 5CT OD 4-1/2" To 20" Length R1 R2 R3 API 5CT Casing Pipe Grade: H40, J55, K55, L80, L80-13Cr, L80-9Cr, N80-1, N80Q, P110 O.D: 4 1/2"-20" Connection: STC, LTC, BTC, ...