M14x1.25x16.8mm Taper Seat Insert # 44186 Time-Sert M14x.125x16.8mm Taper Seat spark plug inserts QTY 5 Use with kit p/n 4412 or 4412E by Time-Sert Professional repair insert for a high quality repair Fast and reliable repair by Time-Sert Required kit p/n 4412E search# B00I1OHFL4 and sealer 6020 search# B00IZIBJ04 to install.