THREAD REPAIR INSERTS Here?s the easy way to repair stripped threads. Installed with standard drills and taps. No pre-winder tool required. Impossible to cross thread while installing. No tang break-off. May be used in virtually any material...aluminum, magnesium, cast iron, cold rolled steel and plastic ? Provide high strength and reliability. One length per size provides maximum pullout strength. Positive mechanical lock against rotation. Breaks Grade 8 bolts in test after test. Easy to remove.