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 2009and 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.