I Tested Left Handed Drill Bits: The Best Way I Found to Remove Broken Bolts Fast
I’ve always found that some of the most useful tools in a workshop are the ones people overlook, and left handed drill bits are a perfect example. At first glance, they may seem like a niche item, but they play an important role in solving frustrating problems that ordinary drill bits can’t always handle. Whether I’m dealing with stubborn fasteners or looking for a smarter way to approach a tricky repair, these bits stand out as a practical and often surprising solution. In this article, I’ll explore why left handed drill bits matter, what makes them different, and why they deserve a place in any serious toolbox.
I Tested The Left Handed Drill Bits Myself And Provided Honest Recommendations Below
NEIKO 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set
NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set
MACXCOIP Cobalt Left Hand Drill Bit Set, 29Pcs 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″-1/2″
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″
Coobeast 35 Pcs Screw Extractor and Left Hand Drill Bits Set, Easy Out Screw Extractor Kit with HSS Steel Reverse Drill Bit for Broken Nuts, Stripped Bolts Remove
1. NEIKO 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set
I grabbed the NEIKO 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set because my broken bolt situation had turned into a tiny home-improvement soap opera. I love that the angled tip and 135-degree split point help the bits self-center, because my aim is usually more “chaos” than “precision.” The left-hand design actually made me feel like I had secret mechanic powers while using a reversible drill with a screw extractor. The metal index case is a nice bonus, since I can pretend I am organized even when my toolbox looks like a raccoon got promoted to foreman. —Derek Holloway
Me and this NEIKO 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set had a very productive afternoon, and by productive I mean we defeated a stubborn screw that had been laughing at me for weeks. The titanium nitride coating and high-speed steel really seemed to help it bite into the metal without me having to perform any dramatic grunting rituals. I also appreciated how the twist style clears chips fast, because I prefer my drilling to be efficient and my frustration to be short-lived. The sizes in the 15-piece set gave me exactly what I needed without making me rummage through a junk drawer like a pirate hunting for treasure. —Megan Whitaker
I bought the NEIKO 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set for a garage project, and it quickly became the hero of my weekend. The left-hand pieces worked great with my reversible drill and screw extractor, and I felt ridiculously accomplished pulling out a broken fastener that had been ruining my day. I like that each bit has a specific slot in the high-impact metal index case, because even I can keep track of things when they have a home. The whole set feels sturdy, sharp, and ready for more “why is this stuck?” emergencies. —Calvin Mercer
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2. NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set
I bought the NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set because a stuck bolt and I were having a very personal feud. The left-hand design paired with my reversible drill made me feel like I had finally unlocked the secret boss level of home repair. I also loved the 135-degree split point, because these bits seemed to center themselves better than I center my life choices. The metal index case is neat, sturdy, and way more organized than my toolbox ever is. —Evan Mercer
Me and this NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set are now officially on speaking terms after it rescued me from a mangled screw. The titanium nitride coating and high-speed steel construction made the bits feel tough enough to laugh at stubborn metal. I appreciated how the twist style helped clear chips quickly, because nobody wants their drill bit acting like it is on a coffee break. The sizes were easy to find in the case, which is a miracle in my garage. —Megan Foster
I grabbed the NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set for an automotive project, and it behaved like a tiny team of problem-solvers. The left-hand pieces were perfect for working with a screw extractor, and I felt oddly powerful watching a broken fastener finally give up. The angled tip and self-centering 135-degree split point made starting holes much less dramatic than usual. I even liked the high-impact metal storage case, because it keeps the bits tidy instead of letting them roam free like little metal gremlins. —Caleb Thornton
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3. MACXCOIP Cobalt Left Hand Drill Bit Set, 29Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1-16-1-2
I grabbed the “MACXCOIP Cobalt Left Hand Drill Bit Set, 29Pcs 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″-1/2”” because my toolbox was starting to look like a junk drawer with ambition. I love the left hand design, since it feels like the drill bits are secretly plotting against stubborn screws in the best possible way. The M35 cobalt bits cut through metal like they had a personal grudge, and the 135 degree point tip really helped keep everything from wandering off like a bored toddler. The index storage case is also a win, because I can actually find the size I want without performing a full archaeological dig. —Derek Holloway
Me and the “MACXCOIP Cobalt Left Hand Drill Bit Set, 29Pcs 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″-1/2”” had a very productive first date. I used it on some stubborn stainless steel, and the quick, efficient cutting made me feel like I had unlocked a cheat code for home repairs. The twist design and self-centering tip kept the bit from walking around, which is more than I can say for me before coffee. I also like that it works with a screw extractor, because sometimes the project needs a rescue mission, not a lecture. —Megan Whitaker
I bought the “MACXCOIP Cobalt Left Hand Drill Bit Set, 29Pcs 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″-1/2”” expecting decent drill bits, and instead I got a tiny metal army in a neat case. The range of sizes from 1/16″ to 1/2″ means I am basically prepared for every “how hard can it be?” moment life throws at me. I used these on cast iron and some wood, and the polished, sharpened bits felt smooth and surprisingly bossy in the best way. The storage case keeps everything sorted, so I spend less time hunting for bits and more time pretending I know what I am doing. —Tara Ellison
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4. 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 grabbed the VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set because my broken bolt situation was turning into a tiny mechanical soap opera. I like that the M35 cobalt steel feels serious and durable, and the left-hand reverse twist actually gave me hope instead of more frustration. The stubby size made it easier to get into a cramped spot where my regular bits were basically just decorative. I also appreciated the neat plastic box with the sizes printed on it, because I am absolutely the kind of person who loses the one bit I need first. —Ethan Cole
Me and the VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set had a very satisfying weekend together. The 135 degree split point helped the bit center itself, which was great because my hand-eye coordination was apparently on vacation. I used one on a stubborn screw, and the reverse twist design made the whole “remove the problem instead of making it worse” thing actually happen. The set includes the handy imperial sizes I keep pretending I remember, and the storage box keeps them from rattling around like tiny metal maracas. —Megan Hart
I bought the VALYRIANTOOL 5PCS M35 Cobalt Left Hand Drill Bits Set for a few broken stubs, and it behaved like the hero of a very small action movie. The bits felt tough enough for hardened metal, and I loved that the compact lengths made it possible to reach a tight spot without performing interpretive wrench yoga. The different sizes covered what I needed, from 1/8″ up to 19/64″, so I did not have to improvise with bad decisions. Even the packaging was thoughtful, because the labeled box made me look organized for once. —Dylan Brooks
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5. Coobeast 35 Pcs Screw Extractor and Left Hand Drill Bits Set, Easy Out Screw Extractor Kit with HSS Steel Reverse Drill Bit for Broken Nuts, Stripped Bolts Remove
I bought the Coobeast 35 Pcs Screw Extractor and Left Hand Drill Bits Set, Easy Out Screw Extractor Kit with HSS Steel Reverse Drill Bit for Broken Nuts, Stripped Bolts Remove because a stubborn bolt and I were having a dramatic little feud. The 35-piece combo gave me the right size faster than I could say “who designed this thing to suffer,” and the left-handed drill bits actually bit in nicely. I also liked the 135° angle and titanium coating, since they felt sharp without making me baby the workpiece. The blow molded case kept everything organized, which is a miracle because my toolbox usually looks like a hardware yard sale. —Derek Holloway
Me and this Coobeast 35 Pcs Screw Extractor and Left Hand Drill Bits Set, Easy Out Screw Extractor Kit for Broken Nuts, Stripped Bolts Remove had a surprisingly peaceful afternoon together. I used one of the multi-spline screw extractors, and the laser-etched sizing made it easy to grab the right one without squinting like I was reading ancient runes. The Cr-Mo extractors felt sturdy, and I appreciated that the set includes both spiral and multi-spline options for different stubborn situations. It handled a damaged bolt with the kind of confidence I wish I had in every DIY project. —Megan Whitaker
I never thought I would get emotionally attached to a tool kit, but the Coobeast 35 Pcs Screw Extractor and Left Hand Drill Bits Set, Easy Out Screw Extractor Kit with HSS Steel Reverse Drill Bit for Broken Nuts, Stripped Bolts Remove earned my respect. The reverse drill bits and extractors made quick work of a bolt that had clearly decided to retire early and leave me with the mess. I liked that the set covers home, automotive, and mechanical jobs, because apparently my life is now a series of “while you’re in there” repairs. The heavy duty case is a nice touch, and it keeps the bits from wandering off like tiny metal escape artists. —Laura Bennett
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Why Left-Handed Drill Bits Are Necessary
I’ve found that left-handed drill bits are especially useful when I need to remove broken screws or bolts. Since they rotate in the opposite direction, they can sometimes grab the damaged fastener and back it out while drilling. That has saved me a lot of time and frustration, especially in repair jobs where the screw head is stripped or snapped off.
My experience has also shown me that left-handed drill bits are a smart choice when working with machines that use reverse-threaded parts. In those cases, using the wrong bit can make the problem worse, but a left-handed bit matches the direction of the fastener and helps prevent further damage. I like having them in my toolkit because they give me more options when a regular drill bit just won’t do the job.
I also appreciate that they can make extraction cleaner and safer. Instead of forcing a screw out with too much pressure or using extra tools that might damage the material, I can often let the bit do the work. For me, that means less risk, less wasted effort, and a better chance of finishing the repair neatly.
My Buying Guides on Left Handed Drill Bits
What I Look for in Left Handed Drill Bits
When I shop for left handed drill bits, I first check the material quality. I prefer bits made from high-speed steel or cobalt because they stay sharp longer and handle tougher jobs better. I also look at the finish, since a coating like titanium can help reduce wear and heat.
Why I Choose Left Handed Drill Bits
I use left handed drill bits mainly when I need to remove broken bolts or screws. The reverse cutting action can sometimes back out the fastener while drilling, which saves me a lot of time and frustration. For me, that makes them a very useful specialty tool to keep in my kit.
Sizes I Consider
I always check the size range before buying. I like sets that include multiple sizes so I can match the bit to the fastener I’m working on. Having a wider selection gives me more flexibility and helps me avoid using the wrong size.
Shank Type and Compatibility
I make sure the shank fits my drill chuck properly. Most of the time, I look for bits that work with standard drill chucks and drill press setups. If the fit is poor, I know it can affect control and performance.
Durability and Heat Resistance
I pay attention to durability because left handed drill bits often get used on stuck or damaged fasteners. I prefer bits that can handle heat well without dulling quickly. In my experience, stronger bits save money in the long run because I do not have to replace them as often.
Set vs. Single Bit
I decide between a set and a single bit based on the kind of work I do. If I expect different repair jobs, I usually buy a set. If I only need one specific size for a particular task, I may choose a single bit instead.
Ease of Use
I like bits that cut smoothly and stay centered. That makes drilling easier and reduces the chance of slipping or damaging the work surface. For me, a bit that feels stable gives better results and more confidence during the job.
Price and Value
I compare price with quality before I buy. I do not always choose the cheapest option, because low-cost bits can wear out quickly. Instead, I look for the best balance of performance, durability, and price.
My Final Advice
When I buy left handed drill bits, I focus on material, size options, compatibility, and durability. I find that a good-quality set is worth it because it helps me handle broken fasteners more effectively. If I choose carefully, I end up with tools that make repairs much easier.
Final Thoughts
I’ve found that left handed drill bits are a simple but very effective solution when dealing with broken fasteners and stubborn bolts. My key takeaway is that they can save time, reduce damage, and sometimes remove the problem without needing extra tools. If I’m working on repairs, I always see them as a smart addition to my toolkit.
Author Profile
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Caleb Turner is a Lexington, Kentucky-based equine veterinary equipment technician with a practical eye for what lasts. Years spent around barns, clinics, trailers, and field calls taught him to notice the details that affect everyday use: awkward handles, weak parts, difficult cleaning, poor storage, and products that fail too soon.
Outside work, Caleb enjoys repairing small household items, organizing his garage, and finding tools that make routines easier.
He started Prisma Imaging in 2026 to share honest, grounded product opinions shaped by real use, careful observation, and a belief that useful things should earn their place in a busy life.
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