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Description
Milwaukee RED HELIX Cobalt Twist Drill Bit, 3/8 in. Diameter, 5 in. Length3 8 in. Cobalt Twist Drill Bit for Hard Metals Milwaukees RED HELIX cobalt twist drill bit is engineered for extreme durability and fast drilling in hard metals. A QuadEdge tip and variable helix design improve chip removal and reduce heat, while a thicker tapered web boosts strength for longer life versus black oxide bits. Key Features: Durable Cobalt Construction: Up to 15x life vs. black oxide bits in hard metals Precision Starts: 135 split point
3/8 in. Cobalt Twist Drill Bit for Hard Metals
Milwaukee’s RED HELIX cobalt twist drill bit is engineered for extreme durability and fast drilling in hard metals. A QuadEdge tip and variable helix design improve chip removal and reduce heat, while a thicker tapered web boosts strength for longer life versus black oxide bits.
Key Features:
- Durable Cobalt Construction: Up to 15x life vs. black oxide bits in hard metals
- Precision Starts: 135° split point reduces walking for cleaner holes
- Variable Helix Flutes: 35°–15° geometry accelerates material extraction
- QuadEdge Tip: Stays sharper longer and drills faster with less heat
- Secure 3-Flat Shank: Prevents bit slipping in the chuck for better control
Specifications Table:
| Specification | Details |
|---|---|
| Bit Material | Cobalt |
| Drill Bit Type | Twist |
| Drill Bit Type(s) Included | Twist |
| Individual/Set | Individual |
| Number of Pieces | 1 |
| Pack Size | 1 |
| Material Application | Aluminum, Cast Iron, Duct/Sheet Metal, Stainless Steel, Steel |
| Tools Product Type | Power Tool |
| Shank Style | 3-Flat |
| Shank Diameter | 3/8 in |
| Bit Diameter | 3/8 in |
| Bit Length (in.) | 5 |
| Item Weight | 0.1 lb |
| Drilling Depth (in) | 3.74 |
| Returnable | 180-Day |
| Features | QuadEdge tip, Variable Helix design, Enhanced tapered web, 135° split point |
Frequently Asked Questions (FAQ):
Q: What materials can this bit drill?
A: Designed for aluminum, cast iron, duct/sheet metal, stainless steel, steel, PVC, wood, and more.
Q: What is the shank style?
A: 3-Flat Secure-Grip shank to reduce slipping in the chuck.
Q: What are the dimensions?
A: Bit diameter is 3/8 in.; overall length is 5 in.; shank diameter is 3/8 in.
Q: Is this sold as a single bit or a set?
A: Individual bit (pack size: 1).
Q: Will it work with standard drill/drivers?
A: Yes, it’s compatible with all drill/drivers.
Industrial Precision, Elevated
This sleek cobalt bit brings a refined, hardworking edge to workshop essentials, turning metalwork into a crisp, confident act. The variable helix fluting is a standout, channeling chips away with sculptural ease for smoother, faster holes. Pair it with a brushed-steel drill/driver and a clean pegboard wall to create a purposeful, modern workspace. It’s a small luxury of performance—precise, enduring, and indispensable.
Upgrade your drill kit with Milwaukee’s RED HELIX cobalt bit for faster, longer-lasting performance in hard metals.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 1
Paid for new, received used.
Size: 9.5 Wide, Color: Cognac, Size: 9.5 Wide, Color: Cognac
Arrived dirty as if someone whore it for more than a few days. Maybe I was mistaken, but I saw nothing about “previously used” on the Amazon page. Returned it.
I would suggest that the company use quality control when it comes to shipping. The shoes seem find otherwise. I ordered 9.5 and it was just a bit tight. If I reorder I will go for size 10.
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Reviewed in the United States on June 11, 2026
★★★★★ 5
Overall Great.
Size: 10.5 Wide, Color: Black
Great product. Great value. Great style. Overall great.
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Reviewed in the United States on March 3, 2026
★★★★★ 3
Decent Shoes with Misleading Description (Not Leather)
Size: 12 Wide, Color: Black, Size: 12 Wide, Color: Black
I only look for leather when I’m purchasing dress shoes. Under the description “details” on this item it lists the shoe as leather upper and inner lining. A photo shows “genuine Napa leather lining”. If you keep reading (which I have now that I’ve received the shoes) it shows “faux leather” in the small print and that is not “leather”. I run a small leather business and this irks me because it’s clearly false advertising. The details also show the product is made in Brazil but when they arrived today, the shoe tag shows “Made in China” and “Man Made upper and lower”. I don’t hate the shoes. They look nice. What I know is they won’t hold up over time like leather, which is why the description should be accurate and not misleading.
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Reviewed in the United States on March 28, 2026
★★★★★ 5
Great Wallet
I'm pretty particular when it comes to things that I need to carry at all times when I'm out. When looking for a new wallet back in 2014, I initially went with the oft recommended Saddleback Leather Medium Bifold. Initially, that wallet seemed to be both durable and well made. Unfortunately, after several months in the back pocket, two things became clear: first, the leather was so taught that it was breaking my credit cards in half at the pinch point of the credit card slot. Second, what I took for durability in the thickness of the leather quickly turned into nuisance as I ended up with an inch thick brick that ruined my seating comfort. I called Saddleback regarding the first point and they told me that it was a known issue and if I didn't like it I could send the wallet back, which I did. That left me at a crossroads with a new requirement: I wanted a leather wallet that was thin enough to not be uncomfortable, held 6 credit/id cards and a handful of bills. I searched around until I came across Bellroy. The travel wallet seemed to check all the boxes and added some features I never knew I needed. After 6 years of use, I finally decided that the original travel wallet I bought in 2014 had run its useful life, down to holes in the leather and all. I liked it so much, I bought another one. There are some subtle differences which I will highlight below.
1. Fits in Your Pocket
This is ostensibly the best feature of the wallet. It is large in the two dimensions you shouldn't care about and thin where it counts. I have not found a pair of pants that I would wear that it doesn't fit in. With my passport, 6 credit/id cards, and a dozen bills it is roughly 3/4 inches thick. Fabulous.
2. The Right Pen
I had no idea how useful the pen would be. I find occasion to pull it out at least once a week. I used to carry the wonderful Fisher Space Pen, but no longer do as this fills the role in a much for optimized way. Bellroy is kind enough to include an ink refill with every wallet and I still have the refill from 2014. That's not to delegitimize the previous point; the kind of things I write are forms and other short memos. I wouldn't use the pen to write a novel. The new wallet looks to have a pen that Bellroy have either white labelled or made themselves. I haven't yet written with it, but if it is at least as good as the Walkie it replaced, things should be fine.
3. Added Security
The new wallet takes the split billfold and adds a flap that conveniently hides away the back section from prying eyes. In theory this seems like a useful feature. In practice, the flap is not quite long enough to allow for more than one or two bills without the cavity being visible when the wallet is opened. The new wallet also has RFID shielding which I don't recall being a feature of the old wallet. It sounds like a useful feature now that at least one of my credit cards has a contactless payment feature.
4. Leather
It's a thin wallet so you should expect the leather to be thin as well. I got 6 years out of the first wallet and I'm not a guy who is easy on wallets. It has been in my pocket on rooftops doing solar installations, in machine shops, and on every kind of seat imaginable. My old wallet has been fully submerged in water more than once. With all that punishment, it outlasted the warranty by two times. None of the stitching has failed and the only real damage is two small holes in the outer leatherwork. If you are a business traveler, this should go out of style before it is rendered unusable from wear.
In short, this is a great wallet for everyday use. I approve to the extent that I didn't look for a new choice when my old one wore out.
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Reviewed in the United States on March 15, 2020
★★★★★ 5
Very handy
Color: Sienna
I purchased it because I still use paper boarding passes. With luggage claim paper, your passport and ID card, things could get quite messy if you try to put everything in your bag or backpack’s compartment.
This one organizes all those nicely. Because of its size it accommodates multiple boarding passes and luggage claim papers easily. (They used to get crumpled in international flights, and It annoyed me.). Yet it is compact enough to carry in your pocket.
One negative is its price. It is expensive. But it is a quality product. Nice leather and well made.
If you are willing to spend some $, this will spare you from searching your boarding pass and passport frantically at boarding. Highly recommend.
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Reviewed in the United States on July 4, 2025
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