Description
Features:
Specifications:
- High hardness, unique stepped structure, a drill can open a variety of size aperture.
- Suitable for these work-pieces that hardness is lower than 25 degree and the thickness is beyond 4mm, such as aluminum parts, insulation board, PVC plate, etc.
- The central punch is not needed, small shaking, hard to be broken.
- Used with pistol drill or bench drill, water it to cool while working to prolong its life, the proper drilling speed is 250-400 rpm.
Specifications:
- Material: HSS 4241
- Shank: hex shank
- Shank diameter: 6mm
- Groove: spiral
- Surface treatment: Nitriding black
- Step quantities Step diameter Net weight
- 5 steps 4, 6, 8, 10, 12mm approx. 20g
- 15 steps 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm approx. 137g
Package Included:
2pcs HSS Hex Shank Nitriding Black Spiral Groove Step Drill Bit