The Robert Charles Plain Shank Counterbore is a precision tool built for engineers, machinists, and automotive technicians who demand reliable, clean counterbores in metal. Crafted from M35 HSS-E with 5% cobalt, it delivers outstanding heat resistance and wear life to sustain performance across challenging jobs.

• Material: M35 HSS-E with 5% cobalt for enhanced heat resistance, wear life, and consistent cutting performance.
• Shank Type: Plain shank design for straightforward fitment in standard tool holders, delivering stable, reliable machining.
• Pilot Size: 0.531" pilot size to accurately guide the counterbore and ensure concentric results.
• Cap Screw Size: 1/2" cap screw size, suitable for common assembly and fixture setups.
• Geometry: Precision-fluted cutting edges designed for clean, true counterbores with minimal burrs.
• Applications: Ideal for precision engineering, automotive work, and general workshop tasks requiring durable, repeatable bore quality.

With its robust cobalt-infused HSS and stable plain shank, this counterbore tool helps you achieve accurate depth and smooth finishes in a variety of metals. Designed for repeatable performance, it reduces setup time and delivers dependable results across multiple jobs, from fixture work to fastener installations, making it a reliable choice for shops that value consistency and durability.