1. You can save processing steps and time costs, improve efficiency.
2. Its a spiral groove, within the processing thread, cutting up to exclude, and was curled applied internally threaded through holes.
3. Wearable and long life.
Material: High Speed Steel 6542
Surface treatment:Titanium Coated
Size: M3, M4, M5, M6, M8, M10
Suitable For: Iron, cast iron, steel, carbon steel
1 set Drill bits