The Robert Charles Plain Shank Counterbore is built for precision machinists and metalworkers who need clean, accurate counterboring with dependable durability. Crafted from M35-HSS-E with 5% cobalt, it delivers strong heat resistance and wear life for demanding cutting applications.

• Material: M35-HSS-E with 5% cobalt for enhanced heat resistance and extended cutting life.
• Cap screw size: 1/4" compatibility for common fasteners.
• Pilot size: 0.265" for precise alignment and chamfer-free entry.
• Shank type: Plain shank enables easy fitment in standard tool holders and stable machining.
• Counterbore design: Optimized for accurate, clean counterboring to create precise flat-bottom recesses.

Designed for reliability across precision engineering, automotive work, and general workshop tasks, this counterbore helps you achieve consistent results with fewer reworks. The plain shank simplifies setup in common tool holders, while the cobalt-infused steel maintains sharpness through extended cutting cycles. For best performance, pair with proper speeds and feeds, use adequate coolant, and ensure firm workholding to maximize tool life and accuracy.