The Toolex HSS-E Piloted Counterbore with a 180° cutting edge is built for precision-focused workshops and professional machinists who demand clean, flat-bottom recesses for metric fasteners. Designed around an M4 size, this tool delivers reliable alignment and consistent results in a variety of materials.

• Material: HSS-E (high-speed steel with cobalt) for enhanced strength, wear resistance, and heat tolerance during heavy-duty counterboring.
• Cutting Edge: 180° cutting edge creates flat-bottom, uniform counterbores for precise screw seating.
• Piloted Design: Integrated pilot ensures accurate alignment and stable guidance through the workpiece.
• Size: M4, suitable for standard metric fastener countersinking and seating applications.
• Durability: Cobalt-infused alloy maintains performance and edge retention in challenging materials.
• Applications: Ideal for creating clean recesses in metals and other machinable materials with repeatable depth control.

This counterbore is engineered to minimize chatter and rework, helping you achieve professional-quality finishes faster. The combination of HSS-E material and a precise piloted design translates into consistent depth, smooth walls, and reliable seating for M4 screws across a range of project work—from automotive components to metal enclosures and cabinetry hardware.