Easy to Use: This spark plug thread tapping tool set is simple to operate and provides a convenient solution for repairing damaged spark plug threads. It is a practical accessory for automotive maintenance.Four Sizes: This spark plug thread repair tool includes four different insert sizes, compatible with various 14mm thread spark plugs. Tap dimensions: 73x24x11mm (2.9x1x0.4 inches). Spark plug insert thread diameter: 14mm (0.55 inches). The set includes four inserts with different thread pitches, ideal for repairing ignition threads on 14mm spark plugs. This kit is suitable for replacing worn or missing tools.s: Made from hardened carbon steel, these tools are durable and built to last. The construction ensures resistance to wear and supports long-term use, helping to extend the life of your spark plugs and reduce maintenance costs.Product Includes: 1 x thread tap, 4 x spark plug inserts. This kit includes a thread tap and multiple inserts designed to restore damaged spark plug threads effectively, providing reliable performance for engine repair and maintenance.