Description
- Treated by to increase the hardness and abrasion .
- 14 sizes, 4-42mm(4, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42mm)
- Made of high speed steel, and long lasting.
- Automatically deburr holes as you drill.
- suitable for workpieces with hardness 25°, Widely to cut holes in a of material like steel, , thin , aluminum , insulation boards, PVC , .








