... drill collar No. 7-1-0552, drill pipe, No. 5D-0104, tubing No. 5CT-0967. The company is now producing ... Liande can provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade C, K ... designed and manufactured according to the API Spec 11 B, grade KD, HL and HY according to SY/T5029-2006 standard ... or big-pump capacity oil-well. And grade K, KD and KH sucker rod are made from fine Cr- ...