THREADED INSERT FOR METAL – E-Z LOK Coil Thread Inserts for metal. Also known as wire thread inserts or helical threaded inserts. QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in soft metals with this steel thread insert. 18-8 STAINLESS STEEL WIRE – 18-8 stainless steel threaded inserts that are resistant to corrosion and can withstand temperatures to 800°F. FOR USE WITH APPLICATIONS – The threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc. STRONG THREADS MADE EASY – Before installation, the metal threaded insert diameter is larger than the hole and then reduced during installation.