HELI has been engaged in the precise machining and manufacturing of petroleum tools for many years. In addition to conventional standard downhole tools, HELI is also good at high precision, non-standard downhole tools and mechanical parts, such as high strength incliners and special fishing tools. HELI has dozens of CNC machine tools and ordinary machine tools. We prossess experienced R&D team. CAD / CAM / 3D mapping is used in all manufacturing processes, and the quality control system of API Q1 is adopted to make the products reach the best state.