China Ningbo Jingda Hardware Manufacture Co., Ltd., founded in 1994, is a medium size China manufacturer of precision machining, oilwell component, oilwell components and stamping metal parts. Briefly speaking, the capacity of professional production lines and synthetical strength are in leading status in China, moreover, factory sticks to the spirit of "Human based, credit cooperation, customer uppermost, create brilliance" to welcome all the guests from the whole world. Factory insists on the theory of first quality. It such as oilwell component, oilwell components, standoff pure charge, charge case, cap pure, insert, perforation, perforation gun adapted all kinds of advanced inspection apparatus or gauges during all the processes, such as TR-200 roughometer, CPJ-300 projector, and HR-150 hardometer.