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Item #:
21169675
BOSCH CO21B 21-Piece Assorted Set with Included Case Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel,
Item #:
21169675
NZD 113
Price Details
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In stock
Imported from USA store
QTY:
Order now and get it around Saturday, August 29
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BOSCH Cobalt M42 metal drill bits deliver 10x life vs. Standard bits, withstand high-heat applications and provide superior performance in stainless steel.
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What Stands Out
Cobalt M42 Material
Manufactured with premium Cobalt M42, this drill bit offers exceptional durability and heat resistance, making it ideal for tough materials like stainless steel and titanium.
Three-Flat Shank
The innovative three-flat shank design ensures a secure grip in the chuck, minimizing slippage during drilling and enhancing precision in your metalworking tasks.
Versatile Applications
Designed for a variety of materials including cast iron and aluminum, this drill bit meets diverse drilling needs, making it a reliable choice for both professionals and DIY enthusiasts.
Product Details
Who Should Buy?
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Metal Workers
Ideal for professionals working with stainless steel and aluminum in mechanical and fabrication settings.
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Hobbyist Machinists
Perfect for DIY enthusiasts who require precision drilling in various metals for personal projects.
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Construction Projects
Great for contractors needing reliable drill bits for drilling through tough metals in construction materials.
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Beginners
Novice users may struggle with proper usage and handling of specialized cobalt drill bits.
Product Description
BOSCH CO21B 21-Piece Assorted Set with Included Case Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum
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Customer Questions & Answers
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Question:
What materials can the BOSCH CO14B drill bits handle?
Answer: The BOSCH CO14B drill bits are designed to efficiently drill through a variety of materials, particularly stainless steel. Their cobalt M42 metal composition affords them exceptional durability and heat resistance, making them ideal for tougher metals. Users often find this set perfect for applications such as metalworking, plumbing, and construction, where precision drilling in hard materials is essential. -
Question:
What is the benefit of the three-flat shank design?
Answer: The three-flat shank design of the BOSCH CO14B drill bits prevents the bits from slipping in the chuck during operation, ensuring a secure grip. This feature is vital for maintaining accuracy and control while drilling. It's especially beneficial in professional scenarios where precision counts, such as in automotive repairs and manufacturing settings, allowing for a smoother drilling experience. -
Question:
Can these drill bits be used with handheld drills?
Answer: Yes, the BOSCH CO14B drill bits are compatible with standard handheld drills. Their three-flat shank design enhances stability, making them suitable for both handheld and stationary drills. Whether you're a DIY enthusiast or a professional tradesperson, using these bits ensures that the drilling process is efficient and effective, particularly in tight spaces or overhead applications. -
Question:
Is the included case durable?
Answer: Absolutely! The included case for the BOSCH CO14B set is designed for durability and optimal organization. It helps protect the drill bits from damage while also making it easy to transport. Its compact design is ideal for both job sites and home workshops, allowing users to keep their tools organized and readily accessible for various projects. -
Question:
How do I maintain my BOSCH drill bits?
Answer: To maintain your BOSCH CO14B drill bits, keep them clean and free from metal shavings after each use. Store them in the included case to prevent damage. Sharpening the bits when necessary will ensure optimal performance. This maintenance routine extends their lifespan and preserves their cutting precision, making them a reliable choice for both casual and professional use. -
Question:
What size drill bits are included in the set?
Answer: The BOSCH CO14B set includes a variety of drill bit sizes, ranging from smaller bits suitable for pilot holes to larger sizes for more substantial drilling tasks. This assortment allows users to select the appropriate size for various applications, enhancing versatility for tasks such as machinery assembly, metal fabrication, and home improvement projects. -
Question:
Are these drill bits suitable for high-speed drilling?
Answer: Yes, these cobalt drill bits are suitable for high-speed drilling applications. Their design allows for efficient drilling at higher RPMs, which can improve productivity, especially in professional settings. Users often leverage this capability in manufacturing environments or metalworking shops, where speed and precision are paramount. -
Question:
Can these bits be used for masonry or concrete?
Answer: While the BOSCH CO14B drill bits are excellent for metal, they are not ideal for masonry or concrete. For those materials, a specialized masonry drill bit is recommended, as they are designed to handle the toughness of concrete and stone. Using the correct drill bit type ensures jobs are completed effectively and efficiently without damaging the tools. -
Question:
What distinguishes cobalt drill bits from standard steel bits?
Answer: Cobalt drill bits, like those in the BOSCH CO14B set, are made from a high-speed steel blend with cobalt, which enhances their strength and heat resistance. This feature makes them superior for drilling hard metals compared to standard steel bits, which may dull quickly. Cobalt bits are particularly advantageous in high-temp applications, making them favored by professionals in tough material scenarios. -
Question:
Where can I buy the BOSCH CO14B 14-Piece Set in New Zealand?
Answer: You can purchase the BOSCH CO14B 14-Piece Assorted Set on Ubuy in New Zealand. Ubuy offers a reliable platform to find this comprehensive drill bit set, ensuring you have access to high-quality tools for your drilling needs. Visit Ubuy to explore the availability and make a seamless purchase for your next project.
Bosch Jobber Drill Bits Editorial Review
The Bosch CO14B is a set of 14 fully ground cobalt drill bits of various diameters from 1/16" to 1/2". The bits come in a pack in a box, and there might be a light oil coating on them. The bits are made in China by Bosch, which utilises a global manufacturing strategy. They can be used for drilling through stainless steel, cast iron, titanium, light-gauge metal, and aluminum, and they should work with any 3-jaw chuck drill driver that holds up to 1/2" diameter shank. The set contains imperial measurement bits.Based on customer reviews, these bits are very strong, sharp, and durable. They are suitable for drilling through alloy, angle iron, and exhaust bolts. Some customers said they struggled to drill through tough materials or had to use a lot of pressure to get the job done. Others noted that the bits started wearing out after a few uses. Overall, most customers seem to be satisfied with this product, and would recommend it to others.
Customer Reviews & Ratings
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Pros
- Strong, durable, precise, and sharp
- Can be used to drill through various materials
- Come in a box and are fully ground
- Suitable for most 3-jaw chuck drill drivers
- Good value for money
Cons
- Might struggle to drill through very tough materials
Platform Trust & Buyer Confidence
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Ranee
Verified buyer
“Paint ordered from USA, u buy got the product to me in New Zealand in approx a week”
22 July 2026 · via Trustpilot
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NordVPN
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“very speedy delivery,tracking info was superb-best experikence ever!!!”
24 June 2026 · via Trustpilot
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Nicholas
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“Love what I received and ordered found that usa clothes are more better quality and look better than the same clothes in my country but are harder to find here recommend ubuy 100%”
22 June 2026 · via Trustpilot
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Dneah
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“Product came earlier than expected (shipped from US to NZ), in about 3 weeks. No damages and product was exactly as advertised!”
15-Jul-26 · via Trustpilot
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Tania
Verified buyer
“Easy to order, easy to track and the product is great to use. Also, the person-to-person (not automated) phone call I got to confirm that I'd received the item was wonderful ??”
11-Jul-26 · via Trustpilot
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Last Updated on August 20, 2026
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NZD 113
Order now and get it around Saturday, August 29
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
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Features & Benefits
- Upgraded M42 Cobalt jobber-length bits
- Contains 8% Cobalt alloy for durability
- Withstand high-temperature applications
- Thick web-helix design for additional stability
- Surface-hardened tip for tough abrasive materials
- Superior performance in stainless steel
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