The Robert Charles Plain Shank Counterbore is a high-performance cutting tool designed for precision metalworking. Built for professionals who require clean, accurate counterbores, it combines cobalt-enhanced steel with a straightforward plain shank for quick, reliable setup.

• Material: M35-HSS-E with 5% cobalt for excellent heat resistance, extended wear life, and dependable cutting performance.
• Shank Type: Plain shank for easy mounting in standard tool holders and chucks, enabling fast tool changes.
• Cap Screw Size: 3/4 inch, providing a robust counterbore capacity for common automotive and precision-engineering parts.
• Pilot Size: 0.781 inch, ensuring accurate alignment and consistent counterbore depth.
• Cutting Geometry: Precision-ground edges designed to produce clean, square counterbores with minimal burrs.
• Applications: Ideal for precision engineering, automotive components, and general workshop projects requiring durable, repeatable results.

Thanks to the cobalt-enhanced HSS-E construction, this counterbore maintains sharpness under demanding cuts, reducing tool downtime and rework. The plain shank simplifies tool changes in everyday setups, while the exact cap screw and pilot sizes deliver repeatable depths and clean finishes. Whether you’re preparing hardened steel surfaces or aluminum workpieces, this counterbore supports consistent tolerances and reliable performance across jobs of varying complexity.