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Description
Milwaukee 5/16 in. Thunderbolt Cobalt Red Helix Twist Drill Bit, 4.5 in Length5 16 in. Cobalt Red Helix Twist Drill Bit This Milwaukee RED HELIX Thunderbolt cobalt twist drill bit is built for hard metals with a variable helix design and QuadEdge tip for cooler, faster drilling. A thicker tapered web and 3 Flat Secure Grip shank enhance strength and reduce slippage for precise, long lasting performance. Key Features: Durable Cobalt Construction: Up to 15x life vs. black oxide bits in hard metals QuadEdge Tip: Reduces heat
5/16 in. Cobalt Red Helix Twist Drill Bit
This Milwaukee RED HELIX Thunderbolt cobalt twist drill bit is built for hard metals with a variable helix design and QuadEdge tip for cooler, faster drilling. A thicker tapered web and 3-Flat Secure-Grip shank enhance strength and reduce slippage for precise, long-lasting performance.
Key Features:
- Durable Cobalt Construction: Up to 15x life vs. black oxide bits in hard metals
- QuadEdge Tip: Reduces heat buildup and speeds drilling with a 135° split point for no walking
- Variable Helix Design: 35°–15° fluted geometry for rapid material removal
- Enhanced Tapered Web: Strengthens the core to resist breakage
- 3-Flat Secure-Grip Shank: Keeps the bit firmly seated in the chuck
Specifications Table:
| Specification | Details |
|---|---|
| Bit Material | Cobalt |
| Drill Bit Type | Twist |
| Drill Bit Type(s) Included | Twist |
| Tools Product Type | Power Tool |
| Individual/Set | Individual |
| Material Application | Aluminum, Cast Iron, Duct/Sheet Metal, Stainless Steel, Steel |
| Number of Pieces | 1 |
| Pack Size | 1 |
| Returnable | 90-Day |
| Shank Style | 3-Flat |
| Bit Diameter | 5/16 in |
| Bit Length (in.) | 4.5 |
| Drilling Depth (in.) | 3.27 |
| Shank Diameter | 3/8 in |
| Item Weight | 0.08 lb |
| Helix | Variable Helix 35°–15° |
| Tip | 135° split point; QuadEdge tip |
Frequently Asked Questions (FAQ):
Q: What materials can this bit drill?
A: Designed for hard metals and also works on stainless steel, cast iron, duct/sheet metal, aluminum, PVC, wood, and steel.
Q: What is the bit length and diameter?
A: Diameter is 5/16 in. and overall bit length is 4.5 in.
Q: Will the tip wander when starting a hole?
A: The 135° split point provides a precision start that helps prevent walking.
Q: What shank style does it use?
A: It has a 3-Flat Secure-Grip shank to reduce slippage in the chuck.
Q: Is this sold as a single bit?
A: Yes, it is an individual 1-piece bit.
Precision Meets Power in Hard Metal
With its warm cobalt sheen and sculpted helix, this drill bit brings refined strength to any workshop. The QuadEdge tip and tapered web elevate performance, turning demanding metalwork into clean, confident cuts. Pair it with a sleek cordless driver and a brushed steel surface for a modern, professional vignette. It’s a small but essential luxury—engineered beauty that works as hard as you do.
Choose Milwaukee’s Thunderbolt Cobalt bit for faster, longer-lasting drilling in hard metals—add it to your toolkit today.
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
4.5 ★★★★★
Based on 30 reviews
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Product Reviews
★★★★★ 5
This is the last mouse you will ever buy
Color: Black, Style: Wireless, Pattern Name: Mouse
Just buy it.
What can be said about this mouse that hasn't been said before? This is the perfect mouse, there is no contest. I know it is a bit on the pricier side, but if you need a mouse, just get the cheapest one you can get and start saving to get this one, IT'S THAT GOOD.
The mouse glides over any decent mouse pad, you don't need to get a Logitech one. The shape is perfect for all kinds of grips and the weight system is great for customization.
The led has different brightness levels, including turning it off completely to save more battery, and the keys are just silent and satisfying to press.
Again, this is the best mouse ever, no other mouse will offer a better value for your money than this one. A bit steep, yes, but worth it.
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Reviewed in the United States on March 20, 2026
★★★★★ 5
One of the best mice I've ever owned
Color: Black, Style: Wireless, Pattern Name: Mouse
I was a little skeptical about this mouse but after 3 weeks of use it's continued to be my favorite mouse. Not only does it. Have a good feel. It is very durable and customizing. The weight is fantastic. If you get the charging pad it just glides. But is definitely worth its money
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Reviewed in the United States on April 19, 2026
★★★★★ 5
Impressive and Comfortable
Color: Black, Style: Wireless, Pattern Name: Mouse
Only after a couple play sessions in BF6 with this mouse, I can already feel how much more precise I can be with it. My first play session was a bit rough getting used to the feel of it. It’s quickly getting more natural. I switched from a ghost keyboards m1 mouse to this.
The left and right mouse clicks feel a bit more stiff than my m1 mouse which I like. Easier to avoid accidental inputs. All the other buttons feel solid with clean clicks.
The mouse wheel is a very different feel with more significant bumps while scrolling, but it adds a more tactile feel being easier to control. It also has a release that lets it just spin for probably more work type use rather than gaming.
It’s easy to setup, basically plug and play but a bit confusing. It comes with of course, a charging cable but the Bluetooth usb comes in some sort of housing that plugs in by the charging cable. Not sure if that is better or worse than how I have it now which is the usb receiver plugged into the back of my pc. Works fine.
Looking at the Logitech website shows up to 48 hours of battery life with default lighting, or up to 60 hours with no lighting. Fully charged it showed 26 hours (25 hours now at 96%). And turning off the lighting at 96% only goes up to 28 hours. Which is plenty as I usually plug my wireless device in to charge after use.
My favorite part of this mouse is how comfortable it is. It’s a bit thicker filling in my smaller hands more compared to my m1 mouse. Another nice added comfort feature is the thumb ledge. It keeps my thumb off my mouse pad, and helps with control of the mouse in high stress fps situations. The weight also help in precise aiming. My m1 mouse was 65g , the g502 is 111g plus the 1 big weight and 2 smaller weights I added making it go up to maybe 119g.
Highly recommend this mouse, and will try to update if it fails prematurely.
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Reviewed in the United States on November 22, 2025
★★★★★ 5
It's just a Proteus Core, but wireless. Wait... it's a PROTEUS CORE, but WIRELESS!!!
Color: Black, Style: Wireless, Pattern Name: Mouse
I've been using a Logitech G502 Proteus Core for a couple of years, and I've been wanting a wireless mouse for ages however, I had been hesitant to switch to anything else because I loved that G502 Proteus Core.
Then, this mouse came out. I knew it was time to upgrade. I get a mouse that looks, feels and performs identically to my Proteus Core. No, scratch that, BETTER than my Proteus Core. Except now no more wire wrangling. No more wire catching on the edge of a table or needing to tape it down. Except the sensor is faster and better than my G502PC, and the wireless mouse is somehow LIGHTER than the wired version. What kind of space age magic is this!?
When I got it at first, I was actually a little disappointed. I had been excited for this new, fancy mouse that was going to step my game up. But then I got it and it just felt exactly like my old one. It felt like nothing has changed. The wait to use it came to a somewhat anticlimactic end.
But then I thought about it and realized..... IT FEELS EXACTLY LIKE MY OLD ONE. I got literally exactly what I loved before, but this time with RGB lighting and no cord! What had I expected? I got literally exactly what I wanted, and it felt like home.
And the battery life, of my goodness, the battery life. I've been using this mouse since mid Early/mid-May. I probably use my mouse for about 1 to 4 hours a day, sometimes every other day depending on schedule. I charged this mouse to 100% on my first day of ownership. I haven't charged it since, and my battery currently reads 64%. Incredible. Over a month of regular and consistent use, with lighting on (at about 60-75% brightness, purple) and I haven't even gotten it to half charge. That tells me I've probably got another month or so of battery life to go!
I have been BEYOND satisfied with this mouse. I only had one minor hiccup. Initially I put the wireless receiver in the rear of the tower, straight into the motherboard's primary USB 3 port. Unfortunately, I noticed that I would get occasional stuttering and hitching with the mouse cursor. After a bit I noticed that it only happened when my cell phone was on my computer desk in front of my mousepad. I relocated the receiver to the USB3 slot on my Corsair K60 keyboard, problem solved. I haven't had one stutter or hitch since. I think my cell phone's WiFi signal was causing some form of interference. I could reproduce the problem with my cell phone location every time, so I'm confident in what the issue was.
BEYOND satisfied with this product. If you have ever used any of the Logitech G502 line - or mice of a similar shape - this product is an absolute NO BRAINER purchase.
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Reviewed in the United States on June 13, 2020
★★★★★ 4
It's a good product but not quite a grand slam..
Color: Black, Style: Wireless, Pattern Name: Mouse
I've tried 15+ different mice in the last few years. It would be a bigger number if I wanted to collect them, but I mainly just try to buy the best small to medium-ish ultralight mice in search of my endgame. Won't buy a mouse without seeing reviews first anymore. However, I did main the old wired G502 for a long time before I became a snob. I still like the G502 shape, scroll wheel, and button layout very much despite the fact that it's not going to help me get high scores in aim trainers. The disadvantages caused by the weight and shape are somewhat, but not totally, made up for by the added functionality of the extra buttons, which are also fantastic for productivity. This is an overall solid product with only a few minor flaws that kept me from giving it a perfect score.
The good:
1. Weight is noticeably reduced compared to the wired version.
2. The button layout every G502 fan fawns over is now on a wireless mouse. And it's genuinely a great button layout.
3. It's wireless, obviously.
4. Top-tier sensor.
5. Excellent battery life.
6. Infinite scroll wheel go brrrrr
The bad:
1. Standard black teflon mouse feet. Not the worst I've seen, but Logitech does have a reputation for putting sh*tty feet on great mice. They at least improved this on the Superlight, but even those were still too thin. These aren't bad, but they could be better.
2. Click feel is substantially worse compared to the old G502. Switches are clearly not the same. Honestly would've been tempted to give this mouse 5 stars if it weren't for the clicks. They aren't heavy and ultra tactile like they were before. They're light and standard-feeling now, which isn't a deal-breaker by any stretch, but it's disappointing.
3. Price. You have to get this thing for less than $100 or it simply isn't worth it. It's a step up from the wired G502 but not to the point of it being worth 3 times as much. Even at a $95 sale price, that's still pushing it.
Summary: you're sacrificing click feel and money to improve weight, obtain a nicer scroll wheel, and rid yourself of the atrocity that is the original G502 cable. You're also getting great battery life and excellent, low-latency wireless tech. It's a good mouse, but it's hard to say it's worth triple the amount of its predecessor, especially if you can replace mouse cables. Do not pay more than $100 for this mouse.
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Reviewed in the United States on July 13, 2021