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Roller Kelly bushing is designed for driving Kelly in the drilling operation. Roller Kelly bushing can be square drive or pin drive, by changing roller sizes, the bushing can accommodate square kellys from 2-1/2" to 5-1/4" or hex kellys from 3" to 6". HDP roller kelly bushing or HDS roller kelly bushing are for high torque and high speed drilling operations. The rollers, roller assemblies, and wiper assemblies of HDP roller kelly bushing are the same as those of HDS roller kelly bushing. MDS, MDP and LDS roller kelly bushing are used for shadow or medium depth drilling operations. Any order of roller kelly bushing for field service is available.