25 pcs M6 X 1.0 Metric Thread Repair Install Tool Insert Kit M6 Helicoil Coil DO
M6 x 1.0 Thread Repair Tool Helicoil Wire Insert Set 25pcs. Thread size: M6 X 1.0mm. 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.