Product Description 17pc M12 Spark Plug Thread Repair Kit PT41101 Repairs damaged spark plug threads internal & External thread sleeve design Installation tools, taps & thread sleeves M15 x 1.25 pitch tap 8 x black sleeves – M12 x 1.25 pitch x 19mm 8 x light colour sleeves – M12 x 1.25 pitch x 12.7mm