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The OEMTOOLS Thread Repair Insert - Metric M14 - 1.25 (10 Piece) is designed to repair stripped threads on non-taper seat spark plugs, and for rethreading many common materials such as alloys, steel and plastics. Specified for automotive, military, aviation and many other uses, the inserts are made from high quality 18-8 stainless steel wire with a diamond shaped cross section wound to the shape of a spring thread. These (10) high-grade replacement inserts are designed for use with OEMTOOLS 25643 Spark Plug Thread Repair Kit - Metric M14 - 1.25.Warning: This product can expose you to chemicals, including lead, which is known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65WARNINGS.ca.gov^