TIME-SERT M10x1.0 Spark plug thread repair kit with inserts P/n 4010-103 M10x1.0 Spark plug thread repair kit with inserts P/n 4010-103 TIME-SERT kit includes 3 inserts 15mm reach and 2 inserts 9mm reach Fast and reliable repair by Time-Sert M10x1.0 spark plug repair kit First time repair only. Do not use if previously repaired.