Home > Jobber Drill Bits > BOSCH CO2159B 1/2 In. x 6 In. Cobalt M42 Drill Bit

BOSCH CO2159B 1/2 In. x 6 In. Cobalt M42 Drill Bit

Hardened Surface, High Heat Resistance, Upgraded M42 Cobalt Jobber Length Bits, Cobalt M42 Drill Bit

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BVR Rating 222 reviews


  • Equipped with surface-hardened tip that helps penetrate better
  • Comes with thick web-helix design that provides additional stability in tough applications
  • Features high heat resistance and hardened surface that offers durability


  • May not be ideal for heavy metal

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Analysis of 200+ reviews for BOSCH CO2159B 1/2 In. x 6 In. Cobalt M42 Drill Bit


BestViewsReviews analyzed 13,890 reviews for 30 products in the Jobber Drill Bits category.


We analyzed a total of 222 reviews for this product out of which, 155 reviews were received in the last 6 months.


The analysis indicates that around 80% reviews were positive while around 18% of reviews had negative sentiment.

BestViewsReviews Ranking and Score for BOSCH CO2159B 1/2 In. x 6 In. Cobalt M42 Drill Bit


This product received a total score of 8.85 out of 10, based on review sentiments and user opinions related to 10 features:

  • Size
  • Value for money
  • Build quality
  • Efficiency
  • Design
  • Customer support
  • Compatibility
  • Overall satisfaction
  • Longevity
  • Easy to use
  • Users of this product said

    These are the best value of any of the bits that I have used. I expected a "beater" set that I would toss at questionable jobs to save my nice ones.

    I think it's a good idea to keep them organized and not lost, as they've lasted this long without waivers, so it's proof that they're worth it.

    I have been using these for a few months now, and they are very durable and easy to clean. They are very easy to repair, and they are very good for metal and wood.

    The 1/4" bit is the most expensive of the three, but it is cutting through STAINLESS steel like butter, and you don't need to grind or heat it first.

    They were very happy with the quality of the steel beam and the drill that they used to push through it, it did require some force, but they had no issues pushing through it.

    Question & Answers


    Where are these manufactured?


    The CO21B is manufactured in China. Robert Bosch Tool Corporation utilizes a global manufacturing strategy, which incorporates a global network of suppliers with our worldwide manufacturing locations in regions such as Asia, Europe, and the United States.


    Is the bit length 6”?


    The CO14B includes (1) 1/16" x 1-7/8", (2) 5/64" x 2", (3) 3/32" x 2-1/4", and (1) 7/64" x 2-5/8", (2) 1/8" x 2-3/4", and (3) 5/32" x 2-3/4".


    Are they forged, edge ground or fully ground?


    The CO14B Cobalt Drill Bit Set is fully ground. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST.


    Bosch is a german company and many things in the US are metric. Where is the m42 metric bit set?


    We have the CO21B M42 drill bit set and the CO14B as well.


    Is the entire bit made of M42 8% cobalt alloy or is it high cobalt steel just on the surfaces?


    They should last longer but cost more because the entire bit is made of M42 8% cobalt alloy.

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