Feature 1THREAD REPAIR TOOLS: Professional spark plug thread repair tools, including 10pcs M12 x 1.25 thread inserts and a M14 x 1.25 thread tap. 2STANDARD SIZES: These repair tools have standard thread sizes, suitable for repairing spark plugs with 14mm x 1.25mm threads. 3STAINLESS STEEL INSERTS: These threaded inserts are made of stainless steel, with galvanized treatment, corrosion resistant and durable. 4HIGH SPEED STEEL TAP: The threaded tap is made of high speed steel, which has high hardness and high heat resistance. 5APPLICABLE MACHINES: Efficient and labor saving, especially suitable for gasoline engines, generators, diesel engines and other machines. Item Type: Spark Plug Thread Repair ToolsThread Insert Size: M12 x 1.25 (thread diameter x pitch)Thread Insert Length: Approx. 17.5mm / 0.7inThread Insert Material: Stainless SteelThread Insert Process: GalvanizedTap Size: M14 x 1.25 (thread diameter x pitch)Tap Shank Diameter: Approx. 9mm / 0.4inTap Full Length: Approx. 90mm / 3.5inTap Blade Length: Approx. 31.8mm / 1.3inTap Material: High Speed Steel Package List 10 x M12x1.25 Inserts1 x M14x1.25Tap