Bosch HSS Step Drill Bit

This Bosch HSS Step Drill Bit (Stock No. 2608597521) covers a diameter range of 6mm to 39mm, making it a highly capable option for professionals who regularly drill larger holes in thin materials across a single job. Its broad stepping range is particularly well suited to electrical installation, cabinet work and sheet metal fabrication, where drilling multiple large-diameter holes quickly and cleanly is essential.

The split-point tip allows for an accurate, burr-free start without pre-punching, even on challenging materials such as stainless steel and sheet plastic. The CNC ground spiral flute reduces vibration and promotes efficient chip clearance throughout each cut, while axial and radial relief grinding ensures consistent cutting smoothness from the smallest to the largest step. Laser-marked diameter figures in both spiral flutes offer clear, lasting reference, and the 3-flat shank provides a secure, slip-resistant fit in the chuck for powerful, controlled high-torque operation.

Features and Benefits:
• Wide 6mm–39mm range handles a broad variety of large-hole professional applications
• Split-point tip for clean, accurate starts with no pre-punching required
• CNC ground spiral flute for efficient chip removal and reduced vibration
• Axial and radial relief grinding for maximum cutting smoothness across all steps
• HSS construction for extended service life — use with coolant for optimal results
• Laser-marked figures in both flutes provide clear, durable diameter identification
• 3-flat shank prevents slipping and ensures confident high-torque transmission

Specifications:
Diameter Range: 6mm – 39mm