Maybe you are a threading purchasing manager, who are looking for high quality threading, and Qingdao Tian Hua Yi He Foundry Factory are a professional manufacturer & supplier that can meet your needs. Not only threading we produced have certificated the international industry standard, but we can also meet your customization needs. We provide online, timely service and you can get professional guidance on threading. Don't hesitate to get in touch with us if you are interested in threading, we won't let you down.