Bosch 3 Piece HSS-TiN Step Drill Bit Set

The Bosch 3 Piece HSS-TiN Step Drill Bit Set provides a versatile solution for drilling multiple hole diameters without changing bits, making it an essential addition to any tradesperson's kit.

Each step drill bit in this set features a split-point tip that starts cleanly without pre-punching, reducing setup time on the job. The CNC ground spiral flute optimises chip removal and minimises vibration, delivering consistent, burr-free results across multiple diameters in a single pass.

The HSS (high-speed steel) construction is coated with TiN (Titanium Nitride), significantly extending service life — particularly when used with coolant. Axial and radial relief grinding ensures the highest cutting smoothness throughout the full range of each bit.

Suitable for use on thin materials including sheet steel, stainless steel, non-ferrous metals, sheet plastic, and plastic, this set covers step diameters from 4–12 mm, 4–20 mm, and 6–30 mm. Laser-marked diameter figures on both spiral flutes make it easy to identify the correct depth at a glance, while the 3-flat shank prevents slipping in the chuck and provides reliable high-torque transmission.

Features and Benefits:
• Three step drill bits covering 4–12 mm, 4–20 mm, and 6–30 mm step diameter ranges
• Split-point tip starts cleanly without pre-punching — no centre punch required
• CNC ground spiral flute for optimised chip removal and reduced vibration
• Axial and radial relief grinding for smooth, burr-free cutting performance
• HSS construction with TiN coating for extended service life, especially with coolant
• Laser-marked diameter figures on both flutes for easy, accurate depth identification
• 3-flat shank prevents chuck slippage and enables high-torque transmission

Specifications:
Version: HSS-TiN
Shank Diameter: 6 mm | 8 mm | 10 mm
Total Length: 66.5 mm | 70.5 mm | 93.5 mm
Step Diameter Range: 4–12 mm | 4–20 mm | 6–30 mm
Step Height: 4 mm
Net Weight: 0.387 kg

Contents:
HSS-TiN Step Drill Bit: 4–12 mm step diameter, 6 mm shank diameter
HSS-TiN Step Drill Bit: 4–20 mm step diameter, 8 mm shank diameter
HSS-TiN Step Drill Bit: 6–30 mm step diameter, 10 mm shank diameter