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eBay£11.00Visit shop 5% Cobalt HSS Drill Bit Set. 13 Metric Cobalt Bits in sizes 1.5mm to 6.5mm
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B&Q£11.89Visit shop B&Q - Blue Spot Tools13Pce Fully Ground 5% Cobalt Drills (1.5-6.5mm)
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The BlueSpot 13 Piece Cobalt Drill Bit Set is designed for professionals and DIY enthusiasts who require precision and durability when working with tough materials like stainless steel and iron. Featuring 5% cobalt integration for enhanced heat resistance and longevity, this set offers a comprehensive range of sizes for various drilling tasks; however, users should note that these bits are primarily intended for precision work and may be brittle if subjected to excessive lateral pressure.
| Model Part Number | 20341 |
|---|---|
| Brand | BlueSpot |
No, these bits are designed for metal and wood. Using them on masonry will cause them to dull almost instantly and likely lead to premature failure.
Yes, the set includes 1.5, 2, 2.5, 3, 3.2, 3.5, 4, 4.5, 4.8, 5, 5.5, 6, and 6.5mm bits.
The addition of 5% cobalt allows the bit to maintain its hardness at higher temperatures, making it far superior for drilling through tougher, heat-resistant metals.
While they will fit in an impact driver chuck, it is recommended to use a standard drill/driver to avoid the impact action, which can snap smaller cobalt bits.
It is highly recommended to use cutting oil when drilling stainless steel or iron to reduce friction, keep the bit cool, and improve the quality of the finish.
Reduce your drilling speed and apply cutting fluid; ensure you are not exerting excessive downward force that prevents the bit from clearing material.
Use a center punch to create a small indentation before drilling to provide a secure starting point for the bit tip.
Stainless steel work hardens easily. Keep the bit cutting constantly without riding on the surface, and ensure you use a steady, moderate feed rate.
The BlueSpot set is compatible with standard corded and cordless drill chucks. To ensure a long service life, avoid applying heavy side-loading pressure, as the hardened cobalt alloy is more susceptible to snapping than softer steel. After use, wipe the bits clean of metal shavings and moisture to prevent oxidation. Store them in their designated slots in the provided carrying case. If the bits become dull over time, they can be sharpened using a high-quality bench grinder or specialized drill bit sharpener, though care must be taken to maintain the original factory angles.
