The Robert Charles Plain Shank Counterbore – Standard Metric (M12) is a precision machining tool designed for accurate counterboring of metric holes. It’s built for engineers, machinists, and workshop teams who need reliable, repeatable results with straightforward setup in standard tool holders.

• Shank type: Plain shank that fits directly into common tool holders for quick, secure mounting and stable alignment.
• Metric design: Standard metric counterbore sized for M12 applications to ensure consistent results across parts.
• Counterbore geometry: Clean, flat-bottom pockets that create precise seating surfaces for socket-head screws.
• Application versatility: Well suited for general engineering, automotive, and workshop use where precision and repeatability matter.
• Reliable performance: Engineered to deliver stable cutting and reproducible results in everyday machining tasks.

This counterbore helps you achieve consistent fastener seating with reduced finishing requirements, enabling faster setups and fewer touch-ups across batches. Its straightforward, plug-and-play compatibility with standard tool holders means less downtime and more productive machining sessions, whether you’re fabricating brackets, housings, or panels that rely on precise metric hole standards.