Production and processing of marine flanges and piping accessories, marine outfitting parts and marine welding materials; manufacturing of crankshafts for ship low-speed diesel engines; manufacturing of precision bearings and special bearings for various main engines; manufacturing of cast and forged blanks for automobiles and motorcycles; manufacturing and sales of fiberglass flanges and pipe system accessories; sales of PVC pipes and accessories, and consulting services, technical consulting, technical services, and technology transfer of related products.