100% brand new and high quality re-threading tap and spark plug inserts A nice tool kit to repair damaged spark plug threads and lengthen the time service plugs Made of hardened carbon steel, these accessories are of strong strength and long durability With four sizes of inserts for different spark plugs 14mm thread size ignition tip Easy to use and operate. Come and try Specification: Material: Carbon Steel Color: As the picture shown Faucet 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< /p> Weight: approx. 153g Package Included: 1* Tap Re-Thread 4* Spark Plug Inserts Features:< /p> 100% brand new and high quality re-threading tap and spark plug inserts. A nice tool kit for repairing damaged spark plug threads and extending spark plug service time. Made of hardened carbon steel, these accessories are of strong strength and long service life. With four sizes of inserts for different 14mm thread size spark plugs. Easy to use and use. Come and try.