“…the best tuning tool since timing lights..” -RPM Magazine
This spark plug cutting tool is the best tool you can buy to make reading your plugs as easy as possible. It fastens to a 2″ trailer frame and acts as a spark plug vice to hold your spark plugs while you cut the threads off of them allowing you to view the entire porcelain with ease!
This kit includes the billet spark plug holder, 2 wing nuts, and a 5/8″ (16mm) hole saw bit.
This is designed for 14mm spark plugs
Or read more about it from RPM Magazine.