1、FOR THREAD REPAIR: This tap insert kit is ideal for repairing peeling or damaged female threads and maintaining threads from galling. 2、DRILL AND TAP: These drills and taps are made of high speed steel, with high strength and wear resistance for quick and easy thread repair. 3、THREAD INSERTS: Spiral wire inserts are heat treated high carbon steel construction for wear and corrosion resistance and long service life. 4、45 STEEL PART: Heat treated 45 steel part fits into enlarged holes for tightening, allowing you to hold bolts, screws or spark plugs in place. 5、MULTIPLE SIZES: Including 5 common sizes, which can be used to repair M5 M6 M8 M10 M12 female thread holes to meet the different repair needs. 1 x Thread Repair Kit (131Pcs Tools)1 x English User Manual1 x Storage Box Item Type: Thread Repair Set5 Common Sizes: M5x 0.8x 6.7mm, M6x1x8mm, M8x 1.25x 10.8mm, M10x 1.5x 13.5mm and M12x 1.75x 16.3mmOuter Box Size: Approx. 375 x 175 x 30mm / 14.8 x 6.9 x 1.2inSpiral Insert Material: High Carbon SteelDrill And Tap Material: High Speed Steel