self tapping insert is a special fastener which is used to strengthen the inner thread on aluminum parts or repair spoiled inner thread hole. metric sizes are in stock. and we can also make customized sizes upon client's request. Shanghai Elite fastener Co.ltd is the right manufacturer focusing on producing helicoil wire thread inserts , self tapping inserts and key lock inserts, and rivet nuts as well , any inquiry, I will give you a quick response.
