1. We supply oil casing 2. Size: 4-1/2"-20" 3. API 5CT certificated 4. Market: Mid East, Africa, America ... oil casing and tubing specificationsOut Diameter:4-1/2”--20"lb/ft9.5-133LengthR1. R2. R3ThreadPTC, STC, LTC, BTCTechniquehot rolledThread protectorPlastic ...