Bosch HSS Set 3Stufenbo. 4-12,4- 20,6-30mm

HSS Step Drill Bit Set 3 pcs. with 3-Flat Shank for Drills and Screwdrivers

If you value clean results and accurate diameters when drilling, this step drill bit set made of HSS steel gives you clear advantages. The cross-ground tip allows you to start drilling straight away – no need for pre-drilling or centre punching. The CNC-milled spiral flute ensures smooth operation and consistent chip removal. Thanks to the 3-flat shank, the bit stays firmly in place – no slipping or readjusting.

Secure hold and clean results
The combination of axial and radial relief grinding creates smooth cutting edges and high cutting performance. The diameters are permanently and clearly laser-marked into the spiral flute – so you always have a clear overview. The HSS steel ensures long service life, especially when used with coolant.

Multiple diameters with just one tool
One drill bit covers several diameters – saving you time and tool changes. The smooth, burr-free holes make this set especially suitable for tasks where clean edges are important. Whether you're working with metal or plastic, you work efficiently and accurately.

Features:

• Cross-ground tip for immediate drilling without pre-drilling
• CNC-milled spiral flute for smooth operation and consistent chip removal
• 3-flat shank prevents slipping in the chuck
• One bit covers several diameters – saves time and effort
• Axial and radial relief grinding for smooth cutting edges
• HSS steel ensures long service life when used with coolant
• Laser-marked diameters for easy reading
• Suitable for metal, plastic and other materials
• Burr-free holes for clean results

Technical Specifications:

• Material: HSS steel
• Cutting technique: axial and radial relief grinding
• Tip: cross-ground
• Spiral flute: CNC-milled
• Diameter ranges: 4–12 mm, 4–20 mm, 6–30 mm
• Marking: laser-engraved in both spiral flutes
• Shank: 3-flat shank
• Suitable for: drills and screwdrivers
• Use with coolant recommended

Scope of delivery:

• 1x HSS step drill bit 4–12 mm
• 1x HSS step drill bit 4–20 mm
• 1x HSS step drill bit 6–30 mm