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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.Positive mechanical locking feature means the insert will never come out!The poloted reamer tap means no drilling is necessary and perfect alignment of the tapped hole.Kit Contents and Replacement Parts:Tap Part No.: 5329-14-1Tool Part No.: 5332-14-1Reach: Extended ReachNote: Heli-Coil recommends removing the head before installation to insure chips do not enter cylinder.Heli Coil 5409-14 Sav-A-Thread - M14x1.25 Extended Reach