... founded in 2005, and strong technical force. More than 300 people, including more than 50 professional and technical personnel ... can provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade C, ... manufactured according to the API Spec 11 B, grade KD, HL and HY according to SY/T5029-2006 standard ... big-pump capacity oil-well. And grade K, KD and KH sucker rod are made from fine Cr ...