Zhejiang Zhongyu Hardware Co., Ltd., formerly known as Hangzhou Xinxing Spring Washer Factory, is a wholly-owned enterprise that produced spring washers earlier in China. Founded in 1995, it has a production history of more than 20 years. Its "Fuda" brand spring washers rank among the top in terms of output, sales volume, and quality in China. Moreover, it has developed spring washers with special materials, specifications, and models such as waveform, saddle shape, spherical shape, triangle, double layer, stainless steel series, brass, and phosphor copper series.