The Robert Charles Plain Shank Counterbore – Standard Metric (M5) is a precision cutting tool designed for accurate counterboring in metric hole work. Built for engineers, machinists, and workshop setups, it delivers stable performance and clean, repeatable results.

• Plain shank design: Compatible with standard tool holders for quick mounting and consistent alignment across setups.
• Metric size: Standard Metric counterbore calibrated for M5 hole standards in general engineering and automotive tasks.
• Counterbore geometry: Precisely formed cutting edge with a flat-bottom profile to seat fasteners flush and squarely.
• Stable cutting performance: Engineered to maintain steady engagement and reduce deviation during repeated passes.
• Ideal applications: Suitable for general engineering, automotive work, and workshop environments where precision and repeatability matter.

With this counterbore, you can achieve smooth, flush fastener seating in metric holes, improving assembly quality and reducing rework. The plain shank and standard metric design simplify tool changes, support repeatable results across parts, and fit seamlessly with common machining setups. Whether you're building prototypes or performing routine maintenance, this tool helps you deliver consistent bore depths and clean edges in every job.