M6 x 1.0 Thread Repair Tool Stainless Helicoil Wire Insert Kit 25PC

Thread size: M6 X 1.0mm. Thread inserts material: Stainless steel. 20PC x Wire thread inserts. Thread tap and the drill material: HSS (High-speed Steel). To repair a spark plug thread no Pre-drilling is necessary if using the special Spark Plug Tap.