[Thread Repair] The spark plug thread repair kit is very easy to use. Use it to cut threads, repair chipped or damaged spark plug threads, and repair spark plug installation in the aluminum head. Thread repair only requires this set of tools and no other complicated tools. Anyone can use it without difficult handling. [Easy to Use] The M14*1.25 thread repair kit is suitable for spark plug repair. Just make sure the spark plug head is aluminum and the kit will do the job. For ease of use, you can also add threadlocker (not included in the package). In addition, the sleeve contains a metal holder to hold the plug inside during installation and removal. [Set Contents] The set includes 14mm to 12mm taps (can be used with a ratchet wrench or 3/8 \" wrench) and 4 blades of 3/8 \", 7/16 \", 1/2 \" and 3/4 \". The tool is comprehensive and easy to use. [High Quality Materials] Our spark plug thread repair kit is made of high quality chrome-vanadium (CR-V) steel. Antioxidant, corrosion resistant and durable. Compared to similar products, we have optimized the quality to withstand more pressure and are not easily damaged.