XinXiang ChangLing Metal Products Co.,Ltd is a professional manufacturer in designation, development and production of Screw thread Inserts and tools, such as threading inserts; Thread Repair Kit; Self tapping Insert; Keensert , tools of Inserts , Etc. We passed ISO9001-2008 in 2005. And keep improving the quality everyday. We have been always trying our best to provide our customers with high quality, the best price and satisfactory services.