Drilling rig spare parts, like gearbox, motor, swivel joint, etc. The advantages of our Kelly bar ,such as low weight,high strength,high abrasion-resistance, highly-reliability are safeguarded technology by superior process, advanced machining equipments and special fixtures. Till now we have dozens of technical patents, ISO9001:2008 certifications, SGS, 35 production proprietary technologies . And we have dealer in Hunan province, middle agent in Singapore, UAE, Thailand. End customer in Colo