The Robert Charles Plain Shank Counterbore is a precision cutting tool engineered for durable, clean counterboring in metalworking and automotive workshops. Built for professionals who demand consistent results, it combines strong performance with easy compatibility in standard setups.

• Material: M35 HSS-E with 5% cobalt for enhanced heat resistance, wear life, and sustained cutting performance under heavy use.
• Shank Type: Plain shank design for straightforward fitment in common tool holders, delivering stable, reliable machining.
• Counterbore Geometry: Precisely ground edges and flute geometry that produce accurate, clean counterbores with repeatable depth control.
• Pilot Size: 0.153 inch pilot to ensure proper workpiece alignment and a true starting point for the counterbore.
• Cap Screw Compatibility: Sized for #6 cap screws, aligning with standard fastener practices in automotive and fabrication projects.
• Applications: Ideal for precision engineering, automotive components, and general workshop tasks where durability and consistent results matter.

With its cobalt-enhanced substrate, the Robert Charles Plain Shank Counterbore maintains edge sharpness longer, reducing tool changes and rework. The sturdy plain shank and robust construction minimize chatter, helping you achieve smooth seating depths and clean, repeatable finishes across multiple jobs. Whether precision-fitting engine components, mounting housings, or preparing fastener recesses, this counterbore delivers dependable performance you can trust project after project.