Feature 1100% Brand new and high quality spark plug re-thread tap and inserts 2A nice tool kit for repair damaged spark plug threads and lengthen spark plugs service time 3Made of hardened carbon steel, these accessories are of strong strength and long durability 4With four size of inserts for different 14mm thread size spark plugs 5Easy to use and operate. Come and have a tryFeatures: 100% Brand new and high quality spark plug re-thread tap and inserts. A nice tool kit for repair damaged spark plug threads and lengthen spark plugs service time. Made of hardened carbon steel, these accessories are of strong strength and long durability. With four size of inserts for different 14mm thread size spark plugs. Easy to use and operate. Come and have a try. Specifications: Material: Carbon Steel Color: As picture shown Tap Size: 73 * 24 * 11mm / 2.9'' * 1'' * 0.4'' Spark Plug Insert Thread Diameter: 14mm / 0.55'' Spark Plug Insert Thread Pitch: 1.25mm / 0.049'' Spark Plug Insert Thread Length: As picture shown Weight: Approx. 153g Package Included: 1 * Re-thread Tap 4 * Spark PlugInserts