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.