M10x1.0x15mm spark plug insert p/n 40103 QTY 5 M10x1.0x15mm spark plug inserts # 40103 Time-Sert QTY 5 Requires kit 4010 search # B00SBVYAYM to install this insert. M10x1.0 spark plugs. professional spark plug repair inserts by Time-Sert Quanity 5 pcs.