BOOMSTART 131pcs Thread Helicoil Repair Kit HSS Drill Thread Insert Repair Tool Sleeves Metric M5 M6 M8 M10 M12

Description:
For repairing damaged threads so that they are ready for use
If special spark plug taps are used, the spark plug threads do not need to be pre-drilled for repair
Larger holes are required for slotless taps
Notes for use:
1. Ensure that the thread and pitch of the tap and bolt match before use
2. Cut fixed threads into cleaned holes using a special...