Bosch HSS Metal Drill Bit - 4mm

The PointTeQ tip is self-centring, which means it starts drilling exactly where you place it, preventing the bit from 'wandering' across the material surface and ensuring greater accuracy.

While the product description mentions compatibility with wood, it is primarily designed and optimized for drilling into metal and plastics. For general wood drilling, a wood-specific drill bit is usually recommended for best results.

It is suitable for drilling clearance and pilot holes in alloyed and non-alloyed steel, non-ferrous metals, cast steel, cast iron, and plastics.

The black-oxide coating on the flute helps to facilitate fast chip removal from the drilled hole, which prevents the bit from overheating and improves drilling efficiency.

The lifespan depends on usage intensity and material hardness. The durable design and reduced heat generation contribute to a longer sharp life compared to standard drill bits, especially when used correctly with lubrication.

This 4mm drill bit is compatible with standard three-jaw drill chucks, which are found on most common power drills.

Yes, using a cutting fluid or lubricant is highly recommended, especially for harder metals. It helps to reduce friction, dissipate heat, and extend the life and sharpness of the drill bit.

Ensure the PointTeQ tip is properly engaged with the material. For very hard surfaces, consider using a centre punch to create a small indentation before drilling.

Check if the drill speed is too low, or if the drill bit is dull. Ensure you are using adequate pressure. For harder metals, apply cutting fluid and consider reducing speed slightly.

Periodically withdraw the drill bit from the hole while it is still rotating slowly to clear packed chips. Ensure the flute is not obstructed.

Excessive sideways force or bending can cause breakage. Ensure the bit is perpendicular to the material and avoid forcing the drill. Check for binding in the hole.