100% brand new and high quality re-threading tap and spark plug inserts A nice tool kit to repair damaged spark plug threads and extend spark plug service time Made of hardened carbon steel, these accessories are of strong strength and long durability With four sizes of inserts for different 14mm thread size spark plugs Easy to use and use. Come and 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 Weight: approx. 153g Package included: 1 * faucet re-threading 4 * Spark Plug Inserts Features: 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.