
HIGH SPEED STEEL TAP: The tap is made of high speed steel with high hardness and heat resistance. STANDARD THREAD: These inserts and taps have a standard thread, the general size is suitable for repairing a 14 mm x 1.25 mm spark plug. Inserts and taps: Includes 10 M14 x 1.25 thread inserts and one M16 x 1.25 tap. This is a professional tool set for repairing spark plug threads. STAINLESS STEEL INSERT: These thread inserts are made of stainless steel, electroplated, and wear-resistant as well as corrosion-resistant. APPLICABLE MACHINE: Tapping is efficient and labor-saving, and very suitable for gasoline engines, generators, motors, etc.