The Robert Charles Plain Shank Counterbore is a high-performance cutting tool built for machinists who demand precision and long life in metalworking. Crafted from M35-HSS-E with 5% cobalt, it delivers reliable heat resistance and wear performance for demanding counterboring tasks.

• Material: M35-HSS-E with 5% cobalt for enhanced heat resistance and extended wear life.
• Shank Type: Plain shank designed for straightforward fitment in standard tool holders, ensuring stable, reliable machining.
• Pilot Size: 0.205" pilot provides precise starting alignment for accurate counterboring.
• Cap Screw Size Compatibility: Sized for #10 cap screws to achieve flush, clean seating.
• Cutting Geometry: Precision-ground edges and flute design deliver clean counterbores with minimal burrs and reduced chatter.
• Applications: Ideal for precision engineering, automotive work, and general workshop counterboring where consistent depth and finish matter.

This counterbore is engineered to minimize downtime and maximize consistency. The cobalt-enhanced steel resists heat buildup during heavy cuts, extending tool life and delivering repeatable results across batches. Its plain shank fits securely in common tool holders, making it a dependable choice for projects that require exact depth control and a pristine finish on cap-screw assemblies.