... . Liande can provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade C, K, D ... and manufactured according to the API Spec 11 B, grade KD, HL and HY according to SY/T5029-2006 standard, and ... -well or big-pump capacity oil-well. And grade K, KD and KH sucker rod are made from fine Cr-Ni ...