Autor: Haiyan Xinglong Fastener Co., Ltd. 

Haiyan Xinglong Fastener Co., Ltd.  As <a href="https://www.xlfasteners.com/product/roofing-bolts/">Truss Head Roofing bolt Manufacturers</a> and OEM/ODM Machine Screws Suppliers in China, Haiyan Xinglong Fastener Co., Ltd. was established in 1994. It is a professional of fastener and machine screws products and a self-operated import and export enterprise approved by the Ministry of Foreign Trade. The company specializes…