Our company mainly produces drilling tools: square and hexagonal kellys, heavy weight drill pipes, spiral heavy weight drill pipes, non-magnetic intergral heavy weight drill pipes, all kinds of drilling collars, lifting subs, non-excavation drill tools, cross-over subs, many kinds of high-precision manufacturing and inspection equipment: special numerical-control pipe thread lathes, large cylindrical lathes, large milling machines, deep-hole boring machine drilling, friction welding, heat treatment production line with medium frequency as well as variety of thread gauges, single measuring instruments, thickness gauges, hardness testers, ultrasonic flaw detectors, ballisticwork testing machines, universal testing machines with microcomputer displaying hydraulic pressure, and so on. With sophisticated production equipment, strict inspecting ways and strong technology, we have mastered the key technique in nationalizing petroleum drilling tools. API standard is implemented strictly throughout the whole process of production. Our company has already passed the Certification of Quality System ISO9001: 2000 and has obtained the product logo licenses of API SPEC 7-1 (Certificate No. 7-1-0625) and API Q1 (Certificate No. 0571), which are issured by American Petroleum Institute. We are the manufacturer. Weigao makes worldwide friends with honest, enduring, reciprocal business styles.