Cobalt A++ Drill Bit 3 – 12mm

Cobalt A++ Drill Bits – Ultra-Hard, Long-Life Performance

Our Cobalt A++ cobalt alloy drill bits are engineered for maximum strength, heat resistance, and cutting performance. Built for professionals who demand reliability, each bit delivers exceptional drilling power through the toughest materials—including stainless steel, hardened steel, cast iron, aluminium, plastics, and wood.

These bits outperform standard HSS and HSS-Co5 alternatives, running cooler, lasting longer, and maintaining sharper cutting edges under extreme conditions.

Available across all sizes: 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, and our multi-size set, these drill bits give you reliable performance for precision pilot holes, fabrication work, engineering tasks, and heavy-duty site use.

Key Features

• Cobalt A++ superior hardness and heat resistance
• Engineered for stainless steel and other hard metals
• Cleaner, faster drilling with reduced walking and improved edge retention
• Long service life even during continuous use
• Precision-ground cutting edges for smooth, accurate holes
• Optimised flute design to remove swarf efficiently and prevent clogging
• Straight shank for secure fit and minimum vibration

Whether you’re on-site or in the workshop, these cobalt bits provide consistent, professional-grade performance every time.

Box & Packaging Information

• Order 5 or more of the same size: Your drill bits come boxed.
• Order fewer than 5: Bits are supplied loose, without a box.

This applies to all available sizes.

All Tool-Fuel products are manufactured to professional-grade standards using premium materials. Our drill bits and cutting tools are precision-engineered for metalworking and woodworking applications, ensuring consistent performance and durability in demanding trade environments.

We offer fast dispatch from our UK and Australia locations. UK orders typically arrive within 2-5 business days, while Australian orders are fulfilled locally for quicker delivery. All orders include tracking information, and you'll receive updates at every stage of the shipping process.