Ningbo Yinzhou Zheng Tai Spring Hardware Accessories Factory is located in Ningbo, Zhejiang, with beautiful scenery, and is a spring manufacturer integrating design, production, sales and service. Our company was founded in 1988. After years of development, now, our company owns advanced CNC production equipment, experienced engineers, technical management personnel and advanced testing equipment. Our company is specializing in the production of coal mine parts of U-cards and D-cards, and all kinds of springs with the wire diameters of 0.15MM-8MM. Our company also produces hardware accessories and metal stamping products. Our products are widely used in major coal accessories, electronics, high-low-voltage electrical appliances, machinery, Autos, lighting, locks, switches, toys, cultural and educational supplies, household appliances, handicrafts, Desk calendars, jewelry and other products.