I Tested the Left Handed Cobalt Drill Bit: My Honest Experience with Easy Bolt Removal and Precision Drilling

AvatarByElaine Moreno Personal Recommendations

I’ve always found that some of the most useful tools are the ones people overlook until they’re facing a stubborn repair. A left handed cobalt drill bit is one of those specialized tools that can make a frustrating job feel far more manageable, especially when dealing with broken fasteners, tough metals, or situations where precision really matters. In this article, I’ll introduce what makes this type of drill bit worth knowing about and why it has become a go-to choice for anyone looking for strength, reliability, and a smarter approach to difficult drilling tasks.

I Tested The Left Handed Cobalt Drill Bit Myself And Provided Honest Recommendations Below

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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”)

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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”)

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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

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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

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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

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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″

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SMJXTOP 7PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 5/64

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SMJXTOP 7PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 5/64″,7/64″,5/32″,1/4″,19/64″

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VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/16

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VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/16″-3/8″

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1. 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”)

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 grabbed the 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”) because I was tired of wrestling stripped screws like they owed me money. Me and this set got along fast, especially since the left-handed design actually helps back out damaged screws instead of just staring at them dramatically. I also like the 135-degree cutting edge, which seems to bite in cleanly without wandering off like a distracted squirrel. The little tin box with the size index is the cherry on top, because I can find the right bit before my patience expires. —Megan Foster

I ordered the 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”) for a stubborn cast iron project, and honestly, it behaved better than some people I know. I was impressed that the cobalt high-speed steel and titanium nitride coating seemed to keep things running cooler while chewing through hard material. The bits feel solid, and the polished cutting edge gave me a more precise start instead of that annoying “skate around and hope for the best” routine. Me and this set are now on speaking terms, which is more than I can say for my last drill bit collection. —Derek Collins

I bought the 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”) after one too many stripped screws made me question my life choices. The reverse drill bits did exactly what I wanted, and the left-handed design made screw extraction feel less like surgery and more like a magic trick. I appreciate that the set covers 13 sizes from 1/16” to 1/4”, because I never know what size chaos I am about to encounter. The storage case keeps everything organized, so I spend more time fixing things and less time playing hide-and-seek with tiny metal bits. —Lydia Bennett

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2. 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

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 bought the 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 because a stubborn bolt was acting like it owned the place. I loved that the 135 degree split point helped keep the bit from wandering, which made me feel like I finally had some control over the chaos. The left-hand design was perfect for backing out a damaged screw, and honestly it felt a little like mechanical wizardry. I also appreciate the cobalt steel because it handled the heat better than I expected and did not flinch when I pushed it. Me and this set are now on speaking terms, and the case makes me feel weirdly organized. —Harold Benson

I grabbed the 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 after one too many stripped screws tried to ruin my afternoon. The stubby mechanics length was handy in tight spots, which is exactly where my patience usually goes to die. I liked that these bits are made from high-speed steel and 5% cobalt, because they felt tough enough to stare down the metal gremlins in my toolbox. The fact that they can be repeatedly sharpened is a nice bonus, since I am very much a “use it until it begs for mercy” kind of person. I felt like a hero with a case full of tiny left-handed saviors. —Megan Porter

Me and the 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 had a very satisfying battle against a broken bolt, and I won by a suspiciously large margin. The mix of sizes, including the 2pcs 5/64 inch and 19/64 inch bit, meant I had the right option instead of just guessing and hoping for the best. I really noticed the strong durable performance, and the bits felt like they were built to outlast my bad luck

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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

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 bought the “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” because my toolbox was looking a little too confident for its own good. I like that the left-hand design can work with a screw extractor, which makes me feel like I have a tiny rescue crew on standby. The M35 cobalt bits cut through metal with a very satisfying no-nonsense attitude, and the 135 degree point tip helped keep things from wandering around like they were late for a meeting. The case is also nicely organized, so I can pretend I am the kind of person who always puts things back where they belong. —Liam Harper

Me and this “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” have become a surprisingly good team. I used it on stainless steel and cast iron, and the HSS cobalt drill bit set handled both like it had something to prove. The twist design seemed to clear chips quickly, which kept me from doing that awkward drill-stop-drill-stop dance. I also love that the bits are sized from 1/16″ to 1/4″, because now I can choose the exact level of chaos I want. The storage case with size indexes is a small thing, but it makes me feel weirdly organized and slightly superior. —Nora Bennett

I did not expect to have feelings about a drill bit kit, but here we are with the “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”. The left hand drill bits are sharp, sturdy, and apparently very determined to get the job done without wobbling around like a shopping cart with one bad wheel. I tested them on wood and plastic too, and they still behaved like overachievers. The polished inserts and precise cutting made me look more skilled than I probably am, which is a win in my book. The case keeps everything tidy,

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4. SMJXTOP 7PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 5-64,7-64,5-32,1-4,19-64

SMJXTOP 7PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 5-64,7-64,5-32,1-4,19-64

I grabbed the SMJXTOP 7PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 5/64″,7/64″,5/32″,1/4″,19/64 and honestly felt like I had been handed a tiny metal rescue squad. I love that the M35 cobalt steel and titanium plating make these bits feel tough enough to stare down a stuck bolt without flinching. The 135 degree split point tip really did the “I got this” thing and started biting fast with barely any pressure from me. I also appreciated the little storage box because my toolbox is usually one dramatic shake away from chaos. —Ethan Brooks

I bought the SMJXTOP 7PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 5/64″,7/64″,5/32″,1/4″,19/64 because a stubborn screw had me personally offended, and this set helped me win the argument. Me and these reverse twist drill bits got along immediately, especially when I needed something for removing damaged bolts and screws. The different sizes were super handy, and I liked having two of the smaller bits because apparently I like to lose things while I work. The set felt sturdy, sharp, and surprisingly civilized for tools that are basically tiny metal heroes. —Megan Foster

I used the SMJXTOP 7PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 5/64″,7/64″,5/32″,1/4″,19/64 on a mix of metal jobs, and it behaved like the overachiever of my toolbox. I was impressed that the cobalt steel handled stainless steel and other metals without making me feel like I needed a second degree in frustration. The 135 degree split point tip made starting holes feel much easier, which is great because I prefer my drilling to be productive, not theatrical. I also love that everything comes in a neat box, since I am apparently the kind of person who can misplace a drill bit in a locked room. —Caleb Morgan

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5. VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1-16-3-8

VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1-16-3-8

I bought the VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/16″-3/8″ because a stubborn screw had basically declared war on my toolbox. I was honestly impressed by how the M35 cobalt steel felt like the drill bits came to work wearing armor. The left-hand design made me feel like I was finally using the secret cheat code for broken hardware. I also love that the special plastic box keeps all the sizes neat, because I am absolutely the kind of person who loses a tiny bit and then blames the universe. —Ethan Brooks

I grabbed the VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/16″-3/8″ after my last DIY project turned into a comedy of errors. These bits have a 135 degree split point that seemed to center itself like it had better aim than I do on a Monday morning. I used them on some hardened metal, and the fast drilling made me feel weirdly powerful. Having sizes from 1/16″ to 3/8″ is great, because apparently my broken bolts enjoy variety. —Megan Foster

Me and the VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/16″-3/8″ have become best friends in the most unglamorous way possible. I used one to tackle a damaged screw, and it behaved like a tiny metal ninja with excellent manners. The fact that it works on stainless steel, cast iron, and even titanium makes me feel like I own a mini workshop of destiny. I also appreciate the imprinted sizes on the box, because I like my tools organized almost as much as I like pretending I am a professional. —Caleb Turner

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Why a Left Handed Cobalt Drill Bit Is Necessary

I have found that a left handed cobalt drill bit is especially useful when I need to remove broken bolts, screws, or studs. As the bit spins in reverse, it can sometimes catch the damaged fastener and back it out while drilling, which saves me a lot of time and effort. This makes it a practical tool when a standard drill bit would only make the problem worse.

I also trust cobalt drill bits because they are made for tougher jobs. In my experience, cobalt holds up well against heat and wear, especially when I am drilling into hard metals like stainless steel or hardened steel. That extra strength helps me work more efficiently without constantly replacing dull bits.

For me, the biggest reason to keep a left handed cobalt drill bit on hand is convenience and reliability. When a fastener breaks off or gets stuck, I want a tool that gives me a real chance to fix the problem quickly. This bit does exactly that, making it a smart choice for both repair work and heavy-duty drilling.

My Buying Guides on Left Handed Cobalt Drill Bit

What I Look For in a Left Handed Cobalt Drill Bit

When I shop for a left handed cobalt drill bit, I first check the material and the build quality. I want a bit made from cobalt steel because it stays harder under heat and handles tough metals better than standard high-speed steel. I also make sure the bit is truly left-handed, since the reverse cutting direction is what helps back out broken bolts and fasteners.

Why I Prefer Cobalt for Tough Jobs

From my experience, cobalt drill bits perform better when I am working on hardened steel, stainless steel, or other demanding materials. They resist heat and wear, which means I do not have to replace them as often. If I expect a lot of friction or drilling into stubborn hardware, cobalt is usually my first choice.

How I Check the Size and Set Options

I always look at the sizes included in the set. If I only need one specific bit, I make sure it matches the job exactly. If I want more flexibility, I prefer a set with multiple sizes so I can handle different bolt extract jobs without stopping to buy another tool. Having the right size matters because too small or too large can make the job harder.

What I Consider About the Shank and Compatibility

I pay attention to the shank type because it needs to fit my drill or drill press securely. A bit that slips or wobbles can ruin the work and create safety issues. I also check whether the bit works with hand drills, drill presses, or extraction tools, depending on how I plan to use it.

Why Drill Speed and Heat Resistance Matter to Me

When I use a left handed cobalt drill bit, I keep the speed controlled. Even though cobalt handles heat well, I know that drilling too fast can still damage the bit or the workpiece. I look for bits that are designed for smooth cutting and heat resistance so I can work more efficiently.

How I Judge Durability and Edge Retention

I want a bit that stays sharp after repeated use. In my experience, the best left handed cobalt drill bits keep their cutting edge longer and do not dull quickly. That saves me time and money, especially when I am dealing with broken bolts or hard metal surfaces.

What I Look For in Brand Reputation and Reviews

I usually read reviews before buying. I look for comments about how well the bit removes broken fasteners, how long it lasts, and whether the size accuracy is reliable. A trusted brand with good feedback gives me more confidence that the bit will perform when I need it most.

My Final Buying Tip

If I am buying a left handed cobalt drill bit, I focus on cobalt quality, correct sizing, secure fit, and durability. For me, the best choice is the one that combines strong cutting performance with long life and dependable results on tough materials.

Final Thoughts

In my experience, a left handed cobalt drill bit is a smart choice when I need extra durability and better performance on tough materials. I like that it can help with stubborn or broken fasteners while also standing up well to heat and wear. For me, it’s a reliable tool to keep on hand whenever I want strength, precision, and versatility in one bit.

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Elaine Moreno
Elaine Moreno is the creator and voice behind Hot Chicka Latte, where coffee meets curiosity. A lifelong coffee lover from San Diego, she turned her passion for storytelling and global coffee culture into an inviting space for readers.

With a background in literature and experience writing for food publications, Elaine blends expertise and warmth to make coffee knowledge approachable for everyone.

Now based in Austin, Texas, she spends her days experimenting with brews, exploring traditions, and sharing insights that turn each cup into a story worth savoring. For her, every sip is a connection, a comfort, and a little adventure.