Set: Yes, For Material: Metal, Drill Shank: Cylindrical Shank, Drill Type: Step Drill, Hole Diameter: 6-30 mm, 4-20 mm, 4-12 mm
- CNC-machined spiral groove optimally removes chips and enables low-vibration and thus uniform drilling
- Step diameters: 4 mm - 12 mm / 4 mm - 20 mm / 6 mm - 30 mm
- Made of HSS steel and coated with AlTiN (Aluminum-Titanium-Nitride) for maximum durability
- Smooth drilling of holes with different diameters using a single drill
- Center punching is not required, as the drill tip with cross-cut facilitates the start of drilling
- Axial and radial relief grind for maximum cutting performance and absolutely smooth results