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Irwin Granite Drill Bits - 3.5mm X 75mm

Irwin Granite Drill Bits - 3.5mm X 75mm

The Irwin Granite drill bit range has been designed for impact and percussion drilling in very har...

Best current price£8.00from The Range

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The RangeIrwin Granite Drill Bits F - Multi Colour
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£8.00
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OnBuy.comIrwin Granite Drill Bits 5063750452876
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£9.51
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B&Q - Irwin Granite Drill Bits Multi Colour (4.0mm X 80mm)
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£9.92
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DebenhamsIrwin Unisex Multicolor Granite Drill Bits
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£12.00
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Product Information

Full details

The Irwin Granite Drill Bits are specialized tools designed for professional tradespeople and serious DIYers who need to drill into high-density materials like granite, concrete, and natural stone. The primary benefit is their increased durability and precision, thanks to a robust, thickened carbide tip that lasts 40% longer than standard masonry bits; however, users should be aware that these bits are optimized specifically for percussion and impact drilling, which may limit their utility in more delicate or brittle materials.

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BrandIrwin

Extended Product Information

FAQs

Can I use these bits on wood?

No, these are strictly designed for masonry materials like granite, concrete, and stone. Using them on wood will result in poor performance and potentially damage the material.

Do I need a hammer drill for these bits?

While they can work in a standard drill, they are optimized for percussion and impact drilling, so a hammer drill is highly recommended for best results.

How do I know when the bit is worn out?

Look for a dulling of the carbide edges or if you notice a significant decrease in drilling speed/hole diameter consistency.

Are these suitable for ceramic tiles?

These are designed for hard stone and granite; they may be too aggressive for brittle or glazed ceramic tiles, which may crack under impact force.

Can these bits be sharpened?

It is generally not recommended to sharpen carbide tips, as this requires specialized diamond grinding equipment to maintain the correct geometry.

Troubleshooting

Bit is sliding or 'walking' on the granite surface

Use a center punch to create a small dimple in the material before starting, or start the hole at a very low speed.

Drilling progress has stalled

Clear out concrete dust from the hole frequently using compressed air or by pulling the bit in and out of the hole while the drill is running.

Carbide tip shows signs of overheating

Reduce drill speed, apply less forward pressure, and let the bit cool down periodically during the task.

Pros and Cons

Pros

  • Significantly higher durability than standard bits
  • Maintains hole diameter accuracy consistently
  • Specialized carbide tip handles extreme hardness
  • Ideal for heavy-duty granite and concrete work

Cons

  • Not suitable for drilling into metal or wood
  • Limited application for non-masonry substrates
  • Requires proper percussion tools for maximum efficiency

Setup, Compatibility & Care

For optimal results, ensure the bit is securely clamped in your drill chuck to prevent slipping under impact loads. These bits are compatible with any standard drill chuck that supports a 3.5mm shank. To prolong the life of the carbide tip, avoid overheating; pause every few centimeters of drilling if working through deep material to allow the bit to cool. After use, inspect the carbide tip for signs of chipping or extreme wear. Store in a dry, organized drill bit case to prevent the cutting edges from dulling against other metal tools.

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