Beijing JieTaiHaoLi Technology Development Co,.Ltd is a high-tech and comprehensive enterprise integrating  a set of rotary drilling rig  kelly bar manufacturing, piling rig accessories sales, a variety of rotary drilling rig overhaul, repair, to provide technology support services, and importing and exporting trade. Our company manufacturing the kelly bars and its spares have been formed industrialization scale with the volume matching supply capacity. At same time, the quality of the kelly bar is comparable with the foreign phase. Especially improving the crafts and technology of combined full-interlocking kelly bar and interlocking kelly bar....more>>