Size: from 2-3/8'' to 20'' OD All API steel grades and special grades 13 Cr & super 13 Cr PSL-1, PSL-2, PSL-3 API 5CT Threads: NUE, EUE, STC, LTC and BTC Premium connections: High torque connection: DHT/HTC Semi-premium connection: Premium-GT Two-step Intregral Licensed Premium metal-Seal Full 100% CAL-IV

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