What people love (and don’t love)
What people love
- Drills through hard metals like stainless steel, cast iron, and hardened steel with ease and precision.
- Three-flat shank design ensures a secure fit in standard drill chucks without slipping.
- High durability, holds edges well, and maintains sharpness even after extensive use.
- Good value for money, especially for repeated use compared to standard black oxide bits.
- Protective and simple case included for safe storage and transport.
- Consistent, accurate sizing that produces clean, precise holes.
What people don’t love
- Higher cost may deter some buyers compared to cheaper alternatives.
- Requires appropriate technique like low speed and cutting oil to avoid overheating and premature dulling.
- Limited to 14 pieces, which may lack some sizes included in larger sets.
Reliable, high-performance cobalt drill bit set ideal for tough metal drilling tasks.
Summary based on customer review evidence.
Quick facts
- Brand: Bosch
- Price: USD 39.29
- Rating: 4.70 (6831 reviews)
If you drill metal often, bit quality matters—especially on tougher materials where heat and wear can ruin standard bits quickly. The Bosch CO14B set uses M42 cobalt jobber-length bits designed for durability and high heat resistance, with a surface-hardened tip to help penetrate abrasive materials.
You can view the current price and full details on Amazon here.
This 14-piece set includes a range of common sizes (1/16″ through 1/2″) and a 3-flat shank for a more secure grip in the chuck. A 135° split point helps start holes with less wandering, while the thick web-helix design adds stability in demanding applications like stainless steel and cast iron.
- M42 cobalt jobber-length bits designed for durability and high heat resistance
- 8% cobalt alloy for extended bit life vs. standard bits (per Bosch)
- Thick web-helix design for added stability in tough drilling applications
- Surface-hardened tip to help penetrate abrasive materials
- 3-flat shank for improved chuck grip, plus 135° split point
- Includes 14 bits and a carrying case; sizes: 1/16″, 5/64″, 3/32″, 7/64″, 1/8″, 9/64″, 5/32″, 3/16″, 7/32″, 1/4″, 5/16″, 3/8″, 1/2″
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