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The OEMTOOLS Thread Repair Insert - UNC 5/16" - 18 (10 Piece) is designed for rethreading in 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 25604 Thread Repair Kit - UNC 5/16" - 18.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^