PERMA COIL. OUR STAINLESS INSERTS ARE 50% STRONGER THAN THE ORIGINAL THREAD. SHE'D NEVER DO YOU WRONG! SHE'S INCAPABLE OF GUILE! MOST HAND TOOLS ARE FULLY COVERED BY MANUFACTURER UNLESS OTHERWISE STATED.
This product would be ideal for mechanics and DIY enthusiasts working on hard-to-reach spark plug bore areas where standard rebuild kits may not be accessible.