Hangzhou Spring Washer Co.,Ltd. is recognized as one of the longest history and the largest manufacturers of spring washers in China, and in the world as well. The company was founded in 1972,which had been for more than 30 years. The company was one of the first enterprises authorized the right of self-handling import and export business in Zhejiang province, and, to date, it is still the only exporting base of spring washer in domestic. Over the past