The Robert Charles Plain Shank Counterbore is a high-performance counterbore tool designed for precision machining in engineering, automotive, and workshop environments. Made from M35 HSS-E with 5% cobalt, it delivers exceptional heat resistance and wear life for consistent, clean counterboring results.

• Material: M35 HSS-E with 5% cobalt for improved heat resistance, wear life, and cutting performance
• Shank Type: Plain shank for straightforward fitment in standard tool holders and stable machining
• Pilot Size: 0.656" pilot diameter for accurate starting location and depth control
• Cap Screw Size: 5/8" cap screw compatibility, aligning with common fastener specifications
• Cutting Geometry: Optimized counterbore geometry to produce clean, square-bottom holes with minimal burrs

This counterbore is ideally suited for precision engineering tasks, automotive assemblies, and general workshop use where durable tooling and repeatable results matter. The combination of cobalt-enhanced HSS and a plain shank enables reliable performance across a range of materials while providing easy installation in standard setups.