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Internet # 322112891

Model # 48-89-2370

Cobalt Red Helix Drill Bit Set for Drill Drivers (15-Piece)

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  • QUAD EDGE Tip™ delivers precision and stays sharper longer
  • Thicker tapered web design increases bit strength
  • VARIABLE HELIX™ flute on driver bit allows for rapid chip removal
  • View More Details
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Product Details

About This Product

The MILWAUKEE® RED HELIX™ 15PC Cobalt Drill Bit Set is engineered for extreme durability and long life in hard metal applications. The QUAD EDGE™ tip delivers a precision start and features four cutting edges to create smaller chips for faster material removal and less heat leading to improved performance. Designed with a VARIABLE HELIX™ flute that begins with an aggressive 35° helical angle and ends at 15° for rapid chip removal. The bit also features an internal thicker tapered web that greatly increases strength, reducing premature breakage. Ideal for various tough metal applications including but not limited to Stainless Steel, Cast Iron, and Thick Metal. MILWAUKEE® RED HELIX™ Cobalt Drill Bits provide up to 15X life vs. black oxide drill bits. Set is organized in a customizable accessory case designed for use in PACKOUT™.


  • RED HELIX Technology combines QUAD EDGE Tip, VARIABLE HELIX Flute, and thicker tapered web
  • QUAD EDGE Tip Stays Sharper Longer
  • VARIABLE HELIX flute designed for rapid chip removal
  • Thicker tapered web design increases bit strength
  • Cobalt for 15X Life vs. Black Oxide Drill Bits
  • 3-FLAT SECURE-GRIP prevents bit from slipping in chuck
  • Designed for use with Drill Drivers
  • Ideal for use in Hard Metals such as stainless steel, cast iron & black pipe as well as wood & plastics
  • Laser etched size for easy identification
  • Customizable accessory case is designed for use in PACKOUT
  • Return Policy

Product Information

Internet # 322112891

Model # 48-89-2370



Bit Material


Drill Bit Type


Drill Bit Type(s) Included

Assorted Twist Bit Set


No Additional Features



Material Application

Aluminum, Cast Iron, Duct/Sheet Metal, PVC, Stainless Steel, Steel, Wood

Number of Pieces


Number of Pieces

11-20 Pieces



Shank Style


Tools Product Type

Power Tool

Questions & Answers

Q:What is the depth or length of these bits? 3 inches? 5 inches? 6 inches? I need 5 1/2 inches of bit to go through a metal post. Will someone please answer. Thank you.
by|Jul 14, 2024
0 Answer
Answer This Question
Q:Does the set model 48-89-4635 come with a 1/2 inch bit? As shown in picture? This question is for Milwaukee.
by|Apr 4, 2024
2 Answers
Answer This Question

A:  As per previous answer the sizes are listed in one of the pictures, should be in the specs. But they only go up to 3/8 '. As far as.I can see.

by|Apr 9, 2024

    A:  The 21 piece set 48-89-4635 does come with the 1/2 bit. It tell you what is included in it on one of the picture and the 1/2 bit comes with it.

    by|Apr 9, 2024
      1 found this answer helpful
      Q:Can I use this with my M12 2401-20??
      by|Mar 18, 2024
      1 Answer
      Answer This Question

      A:  Hi Rosa, the 2401 accepts 1/4" hex bits, so these twist drill bits will not work with that model! - Milwaukee Tool Social Team

      by|Apr 20, 2024
        Q:Can I use this with my m12 Milwaukee cordless drill driver? Are they compatible?
        by|Jan 14, 2024
        1 Answer
        Answer This Question

        A:  These bits are compatible with drill drivers and impact drivers. - Milwaukee Tool, Social Team

        by|Jan 16, 2024
          Showing 1-4 of 64

          Customer Reviews

          4.5 out of 5

          • 4.5 out of 1,231 reviews
          • 87% recommend this product
          Filter by:
          Showing 1-10 of 1,231 reviews
          Unfortunately can't give this Milwaukee product 5 stars like I'd usually be able to. Drilled out a bolt with a small one and it worked well, stepped up to the bigger 5/16 bit and the tips of the cutting edge broke off before I got 1/4 inch deep in the bolt. That's just not acceptable with a very high quality robust size bit like that... and on very first hole drilled with it! Worse part is I reached out politely to Milwaukee through there website and got no reply. That's probably the most disappointing part... Anyhow, buy them, but I can't say how longevity is gonna be for you. Take a close look at this Pic to see the cutting tip damaged...
          • Verified Purchase
          Response from Milwaukee ToolJul 3, 2024
          We appreciate you taking the time to leave a review on your Drill Bit set, and we are sorry to hear about your experience. A member of our team will be in contact with you shortly to gain further insight and assist. Thank you! - Milwaukee Tool Social Team
          • Verified Purchase
          Like plastic
          Drilling out a bolt should have been easy for cobalt. The titanium drills did better. These drill bits didn’t cut as they should, using lubrication still got hot and snapped. Not recommended.
          Response from Milwaukee ToolJun 24, 2024
          Hello Khalil. Thank you for leaving a revie won your Drill Bit Set. A member of our team will be contacting you to learn more about your experience. Thank you! - Milwaukee Tool Social Team
            This kit comes with the 1/2 bit. These bits are great in a impact driver or drill. Caught these on sale for thirty bucks. The half inch bit cost 22 + tax. Great deal.
            • Verified Purchase
            Did Exactly What It Was Purchased For
            I needed to remove a badly rusted 5 mm screw in a difficult to access location. I wasn't sure whether to go with the Cobalt bits or the Titanium Nitride bits, but eventually settled on the Titanium. I started with a 1/8-inch bit on a six-inch locking extension bar and my cordless drill in low gear. I gradually worked my way up to a 3/16-inch bit, using some cutting oil on each bit. All of the bits cut cleanly into the screw head, which was safely removed after about five minutes of drilling.
              • Recommended
              Sharp, durable bits
              This set is the Milwaukee Cobalt Red Helix 15 pc Drill Bit Set which comes in a sturdy, compact case. No more bits falling out everywhere however some of the bits fit in pretty tightly and are somewhat difficult to remove. Each bit has it's own spot in the case but the labeling is a little confusing (see pic) and hard to see when fully opened. A big plus is the quad edge tip which is pointed and makes it easier to begin your drilling in a precise spot. The larger bits have flattened areas to help the bit from slipping in the base. Sharp and sturdy and easily cuts through most materials.
              • Recommended
              Great quality
              I try to get Milwaukee brand tools every time I need tools. The design, workmanship, and ease of use is always present. This Cobalt metric drill bit set is the same quality I'm used to. This set features 19 bits ranging from 4.5 mm to 10 mm in .5 mm increments. The storage case is durable and designed well. I needed to drill pilot holes in my livestock trailer to mount new lights. The bit worked perfectly. Highly recommended!!
              • Recommended
              only worked at first use to drill a hole in steel
              Only worked at first use to drill a hole in a steel bed frame. The second time to drill second hole, they behaved very differntly from the first time use, much slower than drilling the first hole. after finishedd the fouth hole, the drill head was damaged(see picture)
              Response from Milwaukee ToolDec 18, 2023
              David, we are sorry to hear about your experience with your drill bit set soon after purchase. We want to get you connected to our product management team. Could you email our team at Social.media@milwaukeetool.com? Thank you, Milwaukee Tool, Social Team
                1 found this review helpful
                Does not come with packout case like advertised
                I have been building a large packout set up and specifically ordered this item because it was suppose to come with a packout compatible case. it did not.
                Response from Milwaukee ToolOct 23, 2023
                We recommend reaching out to Home Depot for assistance on your tool. Please feel free to also reach out to our team at social.media@milwaukeetool.com. - Milwaukee Tool, Social Team
                  2 found this review helpful
                  Very sharp and quick acting
                  I just recently used the Milwaukee Cobalt Red Helix Metric Drill Bit Set for Drill Drivers (19-Piece) for installing some metal slide-out shelving in our kitchen cabinets. The 2.5mm bit was the perfect size for pre-drilling the screw holes for the frames. I was impressed by how quickly and effortlessly the bit bored into the cabinet. With 19 individual sizes, there’s a very gradual progression in diameter from one to the next, letting you find just the precise one for the job.
                  • Recommended
                  1 found this review helpful
                  Showing 1-10 of 1,231 reviews