M12x1.25 Spark plug thread repair kit with inserts p/n 4212-125 TIME-SERT M12x1.25 spark plug thread repair kit with 6 inserts by TIME-SERT Includes 2) inserts 9mm 2) inserts 15mm 2) inserts 17.5mm reach Spark plug thread repair kits by Time-Sert professional thread repair Fast and reliable repair by Time-Sert M12x1.25 spark plug repair kit p/n 4212-125