Features and Benefits: * The only thread repair product that can be used to repair both taper seat and gasket type spark plug assemblies * Three insert lengths are available to accommodate all spark plug reaches * Positive mechanical locking feature means the insert will never come out! * The piloted reamer tap means no drilling is necessary and perfect alignment of the tapped hole * Available in kit or set for the do-it-yourselfer and professional engine rebuilder * Sav-A-Thread is the easiest way to permanently repair stripped spark plug hole threads * Virtually all engines built today have aluminum cylinder heads * Combining this with the growing number of do-it-yourselfers and the need for quick, easy, on-the-spot repairs makes Sav-A-Thread a must for every store and shop.