JTHL is a first-class manufacture enterprise to commit to design and develop Kelly bar, drill tools, casing series and others . It is founded in 2004 year, the main workshop located in Beijing. The branch workshop located in Shouguang city, Shandong province, China. Which specialized in producing Kelly bar , refurbished used drilling rig.Drilling rig spare parts, like gearbox, motor, swivel joint, etc. The advantages of our Kelly bar and drilling tools ,such as low weight,high strength,high abrasion-resistance, highly-reliability are safeguarded technology by superior process, advanced machining equipment and special fixtures. Especially the patent technology bigger lock Kelly bar is specially for strong hard rock layer, higher drilling working efficiency, more resistant to wear and tear.Normal standard dimension replacement spare parts as ready stock to ensure quickly delivery time. 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 Colombia, Malaysia, Egypt, Vietnam, Pakistan, etc. We sincerely to supply you with good quality and professional technology.