Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric - 21.0mm Head Dia

The Robert Charles Single Flute Countersink 90° – M35 HSS-E 5% Cobalt – Metric is a precision cutting tool designed for countersinking, chamfering, and deburring metric holes. With a robust 21.0 mm head diameter, it creates clean, flush chamfers that improve fastener seating and edge finish for a wide range of projects—from professional assemblies to home workshops.

• Precise 90° countersink geometry: delivers consistent chamfers and a smooth surface finish in metric holes, reducing post-processing time and ensuring repeatable results.
• M35 HSS-E with 5% cobalt for durability: provides higher hardness and heat resistance, extending tool life and maintaining sharpness when working with stainless steel, alloy steels, and non‑ferrous metals.
• Single-flute design for efficient cutting: enables faster material removal with smoother deburring and reduced clogging, helping you finish holes cleanly and efficiently.

This countersink is built to performance expectations across demanding applications. The cobalt-enhanced steel resists wear and heat, so you can rely on it through multiple holes without frequent tool changes, while the geometry and diameter support consistent results and professional-looking finishes every time.