Haiyan Longcheng Standard Parts Co., Ltd. is located in the beautiful and rich Hangjiahu Plain in eastern China. is a hex flange concrete screw manufacturers, The company's predecessor name is Haiyan Shuangjian Standard Parts Factory. Now it is renamed Haiyan Longcheng Standard Parts Co., Ltd. It has a history of more than ten years. It specializes in manufacturing and selling all kinds of screw products and has the right of self-export.
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