Our company, Nanjing General Industry and Trade Co.Ltd is a professional manufacture of precision parallel and cordwood screw barrels and elements. We have long maintained communication and cooperation with other companies of the same industry both domestic and abroad. Meanwhile, we strive to learn from others’ strong points to enrich our own experience so that we have accumulated strong technical power. And we also have advanced equipments: special CNC machine tool, special automatic screw milling machine, CNC automatic thread grinding machine, precision cylindrical surface grinding machine, and these are operated by Mr. Li Rongguo, who is a senior technician with over 30 years’ professional experience in production and machining and the inventor of cordwood screw elements in China, so that the quality and technical indexes of our products are guaranteed to customers’ satisfaction.The materials of our screw elements are: high-quality double metal alloyX235, X245 made in Switzerland,