The Robert Charles Plain Shank Counterbore is a high-performance cutting tool designed for precision counterboring in metalworking. Built for machinists, engineers, and automotive technicians who demand clean, accurate pockets for cap screws.

• Material: M35-HSS-E with 5% cobalt for excellent heat resistance, wear life, and cutting performance.
• Shank Type: Plain shank for easy fitment in standard tool holders, delivering stable, reliable machining.
• Counterbore Size: Compatible with #8 cap screws, enabling precise pocket dimensions for fast assembly.
• Pilot Size: 0.164 inch pilot to locate and guide the counterbore for consistent depth and alignment.
• Construction Advantage: Optimized geometry and robust metallurgy designed to withstand repeated counterboring in challenging materials.

Designed for precision engineering, automotive work, and general workshop use, this counterbore delivers durable performance and dependable results. The durable M35-HSS-E cobalt alloy minimizes wear during high-rotation, high-pressure counterboring, helping maintain tight tolerances and clean edges across jobs.