XinXiang ChangLing Metal Products Co., Ltd(Delisert) as a leading manufacture and supplier of stainless steel Helical Thread Inserts, Self tapping Inserts, keysert and complete Thread Repairing Boxed Helical Kits, CNC Thread Inserts Machines; Stainless Steel filter; High precision machine parts; We are exporting in over 30 Countries Including U. S. A; U. K; Germany, France, New Zealand Ect! We passed ISO 9001:2008 and SGS in 2005 and Keep Improving the quality everyday.