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The OEMTOOLS 14mm Cylinder Head Rethreading Kit is designed for rethreading damaged spark plug threads in 14 mm aluminum cylinder heads. This set includes a combination tap and reamer and (4) inserts in varied lengths to fit the most common spark plug reaches. Sturdy and strong steel parts ensure long-lasting performance. Its small size lets you store it anywhere and find it easily when you’re in a pinch. The simple but effective design guarantees anyone at any skill level can use this product for an array of projects and repairs.Warning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65WARNINGs.ca.gov^