Dongguan QD Tech, the professional designer, manufacturer and solution provider for variety of springs, both steel strip spring and wire spring, the product line includes Solar PV junction box flat spring, constant force spring, constant torque spring, constant force spring for carbon brush, power spring, wave springs, retaining rings, coil spring, wire forming and variable other springs. With the professional team members of Mechanical Dr. & Senior Spring Expert, we could provide complete design and technical service according to the customer's request. And choosing the right material to ensure products higher performance and more stable quality to assistant structure and meet requirements. As the professional spring products manufacturer, QD-Tech not only input and equipped with high performance full-automatic production machinery and various testing equipments but also continuously dedicated in improving research and innovation in production process, sticking in strict quality control method, developing new technology to assure our customers with the competitive cost, high quality, punctual delivery and top service priority.