Chun Yu Works & Co., Ltd. engages in the manufacture and heat treatment of screws, nuts and polished steel bars as well as design of pollution prevention equipment and undertaking related services. Its products include automotive, bike, railway system, construction and building, steel structure, heavy industry and machinery, aerospace, and green energy fasteners, collated screw, collated autofeed screwdriver, cold drawn and annealing wire, bright steel bar and wire rod, surface and phosphating treatment, waste treatment system, and environmental protection engineering. The company was founded by Chun-Yu Lee in December 1949 and is headquartered in Kaohsiung, Taiwan.