Features THREAD REPAIR TOOLS --- Professional spark plug thread repair tools, including 10pcs M12 x 1.25 thread inserts and a M14 x 1.25 thread tap. STANDARD SIZES --- These repair tools have standard thread sizes, suitable for repairing spark plugs with 14mm x 1.25mm threads. STAINLESS STEEL INSERTS --- These threaded inserts are made of stainless steel, with galvanized treatment, corrosion resistant and durable. HIGH SPEED STEEL TAP --- The threaded tap is made of high speed steel, which has high hardness and high heat resistance. APPLICABLE MACHINES --- Efficient and labor saving, especially suitable for gasoline engines, generators, diesel engines and other machines. Specification:Item Type: Spark Plug Thread Repair Tools Thread Insert Size: M12 x 1.25 (thread diameter x pitch) Thread Insert Length: Approx. 17.5mm / 0.7in Thread Insert Material: Stainless Steel Thread Insert Process: Galvanized Tap Size: M14 x 1.25 (thread diameter x pitch) Tap Shank Diameter: Approx. 9mm / 0.4in Tap Full Length: Approx. 90mm / 3.5in Tap Blade Length: Approx. 31.8mm / 1.3in Tap Material: High Speed Steel Package List:10 x M12x1.25 Inserts 1 x M14x1.25 Tap  Package List 10 x M12x1.25 Inserts 1 x M14x1.25 Tap