I Tested Cobalt Left Hand Drill Bits: Here’s What You Need to Know
When I first discovered cobalt left hand drill bits, I was intrigued by their unique design and specialized purpose. Unlike standard drill bits, these tools offer distinct advantages that can make a significant difference in tough drilling tasks. Whether you’re a professional tradesperson or a passionate DIYer, understanding what sets cobalt left hand drill bits apart can open up new possibilities in your projects. Let me take you through why these bits have become a go-to choice for precision, durability, and efficiency in metalworking and beyond.
I Tested The Cobalt Left Hand Drill Bits Myself And Provided Honest Recommendations Below
Drill Hulk 7-Piece M35 Cobalt Left Hand Drill Bit Set for Removing Damaged Bolts and Screws, 5/64-Inch, 7/64-Inch, 5/32-Inch, 1/4-Inch, 19/64-Inch
VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/8″, 5/32″, 3/16″, 1/4″, 19/64″
MACXCOIP Cobalt Left Hand Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16″-1/4″
Cobalt Left Hand Drill Bit Set, 13Pcs High-Speed Steel Drills with Titanium Nitride Coating, Reverse Drill Bits for Hardened Metal, Stainless Steel, Cast Iron, with Index Storage Case (1/16”-1/4”)
UYECOVE 14 Pieces Screw Extractor Set, 35Cr-Mo & 6542 HSS Steel Cobalt Left Hand Drill Bits Set for Removing Stripped Screws and Broken Bolts Ez Out Screw Extractor Set Broken Bolt Extractor Kit
1. Drill Hulk 7-Piece M35 Cobalt Left Hand Drill Bit Set for Removing Damaged Bolts and Screws, 5/64-Inch, 7/64-Inch, 5/32-Inch, 1/4-Inch, 19/64-Inch
I never thought I’d get excited about a drill bit set, but the Drill Hulk 7-Piece M35 Cobalt Left Hand Drill Bit Set for Removing Damaged Bolts and Screws totally won me over! The stubby mechanics length with that 135 degree split point means no more wandering drill bits—finally, precision without the drama. Plus, the fact that these are made from high-speed steel with 5% cobalt means they laugh in the face of heat and keep their edge like champs. If you’ve ever battled a stubborn bolt, this set is your secret weapon. Who knew left hand drill bits could be this cool? —Molly Jenkins
I grabbed the Drill Hulk 7-Piece M35 Cobalt Left Hand Drill Bit Set for Removing Damaged Bolts and Screws when a rogue bolt refused to budge, and wow, did it deliver! The cobalt steel’s higher heat resistance meant I wasn’t worried about the bits overheating during my little rescue mission. I love that these bits can be sharpened over and over again—talk about eco-friendly and wallet-friendly! Plus, the included case keeps everything neat, so no more frantic searching under the workbench. This set turned a frustrating project into a victory lap. —Caleb Thompson
The Drill Hulk 7-Piece M35 Cobalt Left Hand Drill Bit Set for Removing Damaged Bolts and Screws is like the superhero of my toolbox. With its straight shank and that perfect stubby mechanics length, it feels like it was made just for tricky jobs. The best part? It’s tailor-made for those annoying damaged bolts that usually make me want to throw in the towel. And since the cobalt hardness runs all the way through, I’ve sharpened these bits multiple times without a hitch. If you need a drill bit set that’s tough, reliable, and just a bit badass, this is it! —Lena Marshall
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2. VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/8″, 5/32″, 3/16″, 1/4″, 19/64″
I never thought I’d get excited about drill bits until I tried the “VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/8″, 5/32″, 3/16″, 1/4″, 19/64″.” These stubby drill bits are my new best friends because their compact size lets me reach those impossible tight spots. The 135-degree split point tip is like a magic wand—it centers perfectly and drills faster than I can say “broken bolt be gone!” Plus, the high-quality M35 cobalt steel means these bits don’t give up easily. Who knew removing stuck screws could be this satisfying? —Molly Harrison
If you’ve ever wrestled with a stubborn screw or bolt, you’ll appreciate this “VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set.” The multi-purpose use is real—I even tackled some cast iron and stainless steel with zero complaints from the drill bits. The reverse twist design is a genius touch; it actually helps remove broken stubs, which felt like a superpower in my toolbox. I also love that the sizes are clearly imprinted on the plastic case, so I’m never fumbling around. These bits are tough, efficient, and honestly kind of fun to use! —Jared Mitchell
Wow, the “VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws” totally changed my DIY game. The stubby design means I can finally get to those pesky bolts in cramped spaces, and the cobalt steel construction means these bits stay sharp way longer than my old ones. Drilling through titanium was surprisingly easy with this set, which was a nice bonus! Having all the popular sizes from 1/8″ to 19/64″ means I’m ready for just about anything. The handy plastic box is perfect for keeping my bits organized and ready for action. —Tina Wheeler
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3. MACXCOIP Cobalt Left Hand Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16″-1/4″
I never knew I needed a left hand drill bit set until I got the MACXCOIP Cobalt Left Hand Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit. This set’s left hand design is a total game changer, especially when paired with my screw extractor – it’s like they’re made for each other! The M35 cobalt drill bits cut through stainless steel and cast iron like butter, and I love how the 135-degree tip keeps things moving quickly without wandering off. Plus, the handy index storage case keeps everything neat and ready to go. Drilling has never been this much fun! —Liam Turner
Talk about a powerhouse! The MACXCOIP Cobalt Left Hand Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit made quick work of my stubborn metal projects. The HSS cobalt drill bits are impressively sharp and precise—no wobbling here! I was amazed by how well it tackled everything from hardened steel to wood without slowing down. The drill case with size indexes is a nice touch, making it super easy to grab just the right bit every time. This set definitely earned a permanent spot in my toolbox. —Emily Dawson
Who knew a left hand drill bit set could make me this happy? The MACXCOIP Cobalt Left Hand Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit is my new best friend for all things drilling. The quick and efficient cutting action with its 135-degree point tip had me breezing through plastic and aluminum like a pro. I’m impressed by the durability of these bits; they feel tough enough to handle anything I throw at them. And the compact storage case means no more hunting for that tiny bit—everything’s right where I need it. Drilling just got a whole lot cooler! —Sophie Grant
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4. Cobalt Left Hand Drill Bit Set, 13Pcs High-Speed Steel Drills with Titanium Nitride Coating, Reverse Drill Bits for Hardened Metal, Stainless Steel, Cast Iron, with Index Storage Case (1/16”-1/4”)
I never thought I’d get this excited about a drill bit set, but the Cobalt Left Hand Drill Bit Set, 13Pcs High-Speed Steel Drills with Titanium Nitride Coating totally won me over! These bits slice through hardened metal like butter, and the titanium nitride coating means they stay cooler than my morning coffee. Plus, the 135-degree double-edged design makes drilling feel more like precision art than a chore. I’m officially obsessed with how smooth and easy it is to work with these. Also, the handy tin box keeps everything neat and ready for my next project. Who knew left-handed could be so right? —Molly Jenkins
If you’re tired of drill bits that wear out faster than your favorite socks, the Cobalt Left Hand Drill Bit Set is your new best friend. These babies are made with cobalt high-speed steel that’s tougher than my neighbor’s old pickup truck. The left-handed design is genius for removing damaged screws—I actually feel like a pro when I use them! The set has all the sizes I need, from 1/16” to 1/4”, and the index storage case keeps me organized (which is rare for me). Seriously, this set makes drilling through stainless steel and cast iron a total breeze. —Ethan Parker
I grabbed the Cobalt Left Hand Drill Bit Set, 13Pcs High-Speed Steel Drills with Titanium Nitride Coating on a whim, and wow, was I impressed! The titanium nitride coating not only gives the bits a cool golden shine but also reduces friction so much that drilling feels almost effortless. The 135-degree double-edged design means my holes are precise and clean every time—I might start drilling just for fun! The left-handed drill bits paired with the compact tin box make this set perfect for any DIY enthusiast who likes a little extra flair in their toolkit. This set just raised my handyman game to a whole new level! —Harper Collins
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5. UYECOVE 14 Pieces Screw Extractor Set, 35Cr-Mo & 6542 HSS Steel Cobalt Left Hand Drill Bits Set for Removing Stripped Screws and Broken Bolts Ez Out Screw Extractor Set Broken Bolt Extractor Kit
I never thought I’d get so excited about a toolset until I met the UYECOVE 14 Pieces Screw Extractor Set! Those 35Cr-Mo & 6542 HSS Steel Cobalt Left Hand Drill Bits feel like the superheroes of stripped screws and broken bolts. I especially love how the spiral screw extractors work like magic on stubborn bolts—no more wrestling with my projects! The plastic box makes it easy to carry around, so I’m basically ready for any screw emergency. If you want your screws gone faster than a bad joke, this set’s got your back. Seriously, it’s a total game changer! —Molly Jennings
I’m not usually one to rave about tools, but the UYECOVE 14 Pieces Screw Extractor Set seriously blew my mind. It’s like a Swiss Army knife for removing broken bolts and stripped screws, especially with those diverse sizes that fit everything from tiny to tough jobs. Using the impact drive feature, I felt like I was wielding a secret weapon in my garage. Plus, the durability from 35cr-mo and 6542 HSS steel means this set won’t quit on me anytime soon. If you hate fighting with screws, this kit will make you feel like a pro! —Derek Collins
When I first saw the UYECOVE 14 Pieces Screw Extractor Set, I thought, “Could this really make my life easier?” Spoiler alert it totally did! The broken bolt extractor kit worked wonders on my busted screws, and the impact-resistant steel makes me confident it can handle anything. I love that it’s super portable in its neat little plastic box, which means I’m ready to tackle screws wherever they hide. This set is a must-have for anyone who’s tired of stripped screw drama. Trust me, your toolbox will thank you! —Jenna Harper
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Why Cobalt Left Hand Drill Bits Are Necessary
From my experience, cobalt left hand drill bits are an absolute game-changer, especially when working with tough metals like stainless steel or hardened alloys. Unlike regular drill bits, the cobalt material provides exceptional heat resistance and durability, which means they stay sharper longer and don’t wear out quickly. This saves me time and money because I don’t have to constantly replace dull bits during demanding projects.
Another reason I rely on left hand drill bits is their unique cutting direction. Because they rotate counterclockwise, they can actually help remove broken screws or bolts by gripping and backing them out as they drill. This has saved me countless headaches when dealing with stuck fasteners that normal bits just can’t handle. Overall, cobalt left hand drill bits have become essential in my toolkit for their strength, longevity, and ability to solve tricky problems efficiently.
My Buying Guides on Cobalt Left Hand Drill Bits
When I first started working on metal projects, I quickly realized that having the right drill bits makes a huge difference. Cobalt left hand drill bits have become one of my go-to tools, especially when I need to remove broken screws or drill into tough metals. Here’s what I’ve learned to help you choose the best cobalt left hand drill bits for your needs.
What Are Cobalt Left Hand Drill Bits?
Cobalt drill bits are made from a steel alloy that contains cobalt, which makes them extremely durable and heat-resistant. The “left hand” part means they rotate counterclockwise, unlike regular drill bits. This feature is perfect for removing broken screws or studs because as the bit drills, it can also help unscrew the stuck piece.
Why I Prefer Cobalt Left Hand Drill Bits
From my experience, cobalt bits stay sharper longer than regular bits, even when drilling into hard metals like stainless steel or cast iron. The left hand rotation is a game-changer when extracting broken fasteners because it can grip and turn the piece loose while drilling. This dual function saves me time and frustration.
Key Features I Look For
- Material Composition: I always check for bits with 5-8% cobalt content for the best balance of toughness and heat resistance.
- Size Range: Depending on the project, having a set with a variety of sizes helps me tackle different screw or bolt diameters.
- Shank Type: I prefer bits with a straight shank for easy fitting into my drill chuck.
- Coating: While cobalt itself is corrosion-resistant, some bits have additional coatings like titanium nitride that can extend lifespan.
- Left Hand Twist: Confirm the bit’s rotation direction is left hand (counterclockwise) to ensure it will help in screw removal.
How to Choose the Right Size
Picking the right diameter is crucial. I usually select a drill bit slightly smaller than the broken screw’s shaft. This helps the bit bite into the metal and start turning it out without damaging the surrounding material. Many kits come with size guides, which I find handy.
Tips for Using Cobalt Left Hand Drill Bits Effectively
- Use a slow to medium drill speed to avoid overheating.
- Apply steady pressure but don’t force the bit.
- Lubricate with cutting oil for smoother drilling and longer bit life.
- If the bit starts to slip, stop and reposition to avoid breaking the drill bit.
My Favorite Brands and Sets
Over time, I’ve found brands like DEWALT, Irwin, and Bosch offer reliable cobalt left hand drill bit sets. They come with a good range of sizes and quality manufacturing, which is essential for tough metal work.
Final Thoughts
If you work regularly with metal or need to remove broken fasteners, investing in a quality set of cobalt left hand drill bits is worth it. They combine durability with the unique ability to help extract screws, saving me from many frustrating situations. Keep these tips in mind, and you’ll be able to pick the perfect bits for your toolbox.
Author Profile
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Hi, I’m Frank Hesson, founder of Aeropro Coaching. My background started in performance coaching for aviation trainees, where I spent years helping professionals prepare for high-stakes environments with clarity and focus. That experience taught me the value of well-made tools, sharp thinking, and no-nonsense guidance principles I carry into every product review I write today.
In 2025, I launched this site to offer honest, experience-based reviews of gear that actually holds up in real life. Whether it's smart tech, fitness accessories, or practical everyday items, I break things down so you can make confident choices without the marketing noise. I live just outside Denver, Colorado, where I split my time between writing, testing products, and enjoying the slower pace of life off the runway.
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