Scope of application: Spark plug repair kit, new high-quality spark plugs, tighten the taps and inserts. Suitable for 14MM size. If you don't know the size, please measure it first. Focus on the details of the modification. This is a high-performance modification accessory. Exquisite craftsmanship: Spark plug thread repair kit. A good tool kit for repairing damaged spark plug threads and extending the service life of spark plugs. Practical and convenient, improves the efficiency of spark plug repair work. Four sizes: Spark plug thread tool has four sizes of plugs, suitable for different 14mm thread spark plugs. High-quality materials: These accessories are made of hardened carbon steel, strong and durable. Easy to maintain, spark plug tap reduce your replacement costs and extend the life of car spark plugs Easy to install: M14 spark plug thread easy to use and operate. Package includes: 1 * rethreaded tap, 4 * spark plug insert. You can directly replace the old or damaged ones without damaging your car. Professional installation is recommended. Specifications: Material: Carbon Steel Socket Size: M14*1.25 (9mm length) M14*1.25 (11mm length) M14*1.25 (16mm length) M14*1.25 (20mm length) Spark Plug Insert Thread Diameter: 14mm / 0.55'' Spark Plug Thread Pin: 1.25mm / 0.049'' Package Included: 1 * Re-thread Tap 4 * Spark Plug Inserts