Description HIGH QUALITY SPARK PLUG RE-THREADS AND INSERTS: brand new and high quality QUALITY TOOL KIT: A nice set of tools to repair damaged spark plug threads and extend spark plug service time MADE OF HIGH QUALITY CARBON STEEL: Made of hardened carbon steel, these props are of strong strength and long durability FOUR DIFFERENT SPECIFICATIONS: With four sizes of inserts for different 14mm thread spark plugs EASY TO USE AND USE: Easy to use and operate. 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 the picture shown Weight: Approx. 153g Package included:1*tap re-threading,4*spark plug inserts