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Casing Coupling 1. Steel Grade: J55/K55, L80,N80-1/N80-Q, C90/T95, C110, P110, Q125. 2. Size: 4-1/2" to 20" 3. Thread Type: STC, LTC, BTC 3. Standard: API-5CT, API-5B 4. Certification: API-5CT,