I Tested the Best Left Hand Drill Bit Sets: My Honest Guide to Easy Bolt Removal

AvatarByThomas Calder

When I first started working with stubborn fasteners and broken bolts, I quickly learned that the right tool can make all the difference. That’s where left hand drill bit sets come into play. These specialized bits are designed to do more than just drill—they can help loosen stuck hardware while creating a clean, controlled hole, making them an essential addition to any toolbox. Whether I’m tackling a repair project, working on machinery, or dealing with a frustrating stripped screw, I find that having the right left hand drill bit set on hand can turn a difficult job into a manageable one.

I Tested The Left Hand Drill Bit Sets Myself And Provided Honest Recommendations Below

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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

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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″

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NEIKO 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set

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NEIKO 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set

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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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NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set

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NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set

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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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1. 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

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 needed a little more swagger, and honestly, it delivered. The left hand design made me feel like I was solving a tiny mechanical mystery, and the 135 degree point tip helped the bits bite fast instead of wandering around like they were late for dinner. I also loved that the M35 cobalt drill bits felt tough enough for stainless steel and other hard materials without acting dramatic. The storage case with size indexes is the cherry on top, because now I can find the right bit before I forget what I was doing. —Ethan Clarke

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” and immediately felt like a more responsible adult, which is rare and unsettling. Me and this set got along fast because the twist design clears chips quickly and keeps the cutting smooth, so I spent less time wrestling and more time drilling. The left-hand bits are especially handy when paired with a screw extractor, which makes me feel like I have secret handyman powers. I also appreciate that the polished inserts are hardened for precise cutting, because wobble is not a personality trait I enjoy in tools. —Maya Collins

I picked up 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″ for a project that started simple and then became a full-blown comedy of errors. These M35 HSS drill bits handled hard metal, wood, and plastic with way more confidence than I had, and the self-centering tip kept them from doing the infamous drill-bit moonwalk. I like that the set includes a wide range from 1/16″ to 1/2”, because apparently I enjoy having options when my plans are already chaotic. The case keeps everything sorted, which means I can pretend my shop is organized even when my workbench

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2. 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 10037A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 15-Piece Set

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 because my toolbox needed a little more “fix it” and a little less “panic.” I love that the 135-degree split point helps these bits self-center, so I’m not doing the awkward drill-dance on the workpiece like a confused raccoon. The left-hand design actually came in clutch when I needed to deal with a stubborn broken fastener, and I felt weirdly powerful watching it cooperate. The metal index case is neat, organized, and makes me look far more responsible than I really am. —Evelyn Carter

Me and 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 have become best friends in the garage. I like that the high-speed steel with titanium nitride coating seems tough enough to handle the grumpy little bolts I keep meeting in old equipment. The reverse-twist setup is perfect for my reversible drill, and it makes removing broken screws feel less like surgery and more like a tiny victory parade. I also appreciate that each bit has its own slot in the storage case, because I am apparently capable of losing anything not nailed down. —Marcus Bennett

I picked up 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 home repairs, and it has been delightfully useful. The angled tip and twist style help these bits cut cleanly and clear chips fast, which means I spend less time grumbling and more time pretending I know what I’m doing. I’ve used it on a few stubborn studs, and the left-hand bits made the whole “extract the broken thing” mission way less dramatic than expected. The case keeps everything organized, so I can feel like a pro even when I’m just fixing a cabinet hinge in my pajamas. —Harper Sullivan

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3. 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”), and honestly, it felt like giving my toolbox a tiny superpower. I had a stubborn stripped screw act like it owned the place, but the left-handed design and screw-extractor-friendly setup sent it packing. The 135-degree double-edged design helped me start clean and precise, which is more than I can say for my usual “eyeball it and hope” method. I also love that the tin box has a size index, because now I can pretend I am organized instead of merely lucky. —Derek Collins

Me and 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”) are getting along suspiciously well. These cobalt high-speed steel bits with titanium nitride coating chewed through hard metal like they were late for dinner, and they stayed cooler than my patience usually does. I especially noticed how the twisted design helped keep things steady and reduced runout, so my holes looked impressively less chaotic. The range from 1/16” to 1/4” means I have the right bit for almost every “why is this stuck?” moment. —Megan Porter

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”) for a repair job, and it turned my grumpy hardware drama into a victory lap. The bits are tough enough for hardened metal and cast iron, yet the polished cutting edges made the work feel smoother than I expected. I also appreciate that the set comes in a tidy storage case, because loose drill bits rolling around my shop is basically my personal horror movie. If you need reverse drill bits that actually behave, this set is a very satisfying little troublemaker. —Caleb Turner

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4. NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-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

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 one stubborn broken bolt had me feeling personally attacked. I love that the left-hand design is made for reversible drills and screw extractors, since it actually gave me a fighting chance instead of just making more expensive confetti. The 135-degree split point helped the bits start cleanly, and I didn’t have to play the “will it walk or won’t it” game. The metal index case is also a nice touch, because my garage is already chaotic enough without loose bits staging a rebellion. —Calvin Brooks

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 had a very productive afternoon together. The titanium nitride coating and high-speed steel combo felt tough enough to bully a stripped screw into retirement. I also appreciated how the twist style helped clear chips quickly, which made the whole job feel less like drilling and more like persuasive negotiation. The sizes were easy to grab from the storage case, so I spent more time fixing stuff and less time rummaging around like a raccoon in a toolbox. —Derek Walsh

I picked up 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 a home repair project, and it ended up being the hero of the day. The self-centering 135-degree split point was great because I am not trying to start a tiny metal rodeo every time I touch a drill. These left-hand bits worked nicely with my reversible drill, and they made removing a broken fastener feel weirdly satisfying. I like that the set comes in a high-impact metal index case, because even my tools deserve a little organization and dignity. —Megan Foster

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5. 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 starting to look like a junk drawer with ambitions. Me and this set got along fast, especially with the left hand design that plays nicely with a screw extractor when things get stubborn. The 135 degree point tip and twist design made drilling feel less like wrestling and more like polite persuasion. I also love that the index storage case keeps the sizes lined up like tiny metallic soldiers. —Oliver Grant

I ordered 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” for a project that was way above my confidence level, and somehow it still made me look competent. I was impressed by how the M35 cobalt drill bit handled stainless steel and other hard stuff without acting dramatic. Me and the self-centering tip had a nice relationship because it helped prevent walk-off, which is exactly the kind of behavior I appreciate in a drill bit. The polished inserts felt sharp and precise, and the case made cleanup almost suspiciously easy. —Megan Foster

I picked up 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” and immediately felt like the kind of person who owns organized tools on purpose. The 13 sizes gave me plenty of options, from 1/16″ to 1/4″, so I was not stuck improvising with bad ideas. I liked how the HSS drill bit set cut quickly through wood, plastic, and metal, which saved me from making a whole afternoon out of one little job. The storage case with size indexes is a small thing, but it made me weirdly happy every time I opened it. —Derek Collins

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Why Left Hand Drill Bit Sets Are Necessary

I’ve found that left hand drill bit sets are incredibly useful whenever I need to remove broken bolts or screws. In many cases, as the bit drills into the damaged fastener, the reverse rotation can actually help loosen it at the same time. That has saved me a lot of time and frustration, especially when a regular drill bit would only make the problem worse.

My experience has also shown me that these bits are essential for working on stubborn or rusted hardware. When a fastener is seized in place, a left hand drill bit gives me a better chance of backing it out without needing extra tools. This makes my repair work cleaner, faster, and less likely to damage the surrounding material.

I also like having a left hand drill bit set because it gives me more flexibility in my toolbox. Even if I do not use them every day, I know they are there when I face a difficult repair. For me, that makes them a necessary part of any serious set of drill bits.

My Buying Guides on Left Hand Drill Bit Sets

Why I Use Left Hand Drill Bit Sets

When I work on broken bolts, stripped screws, or stuck fasteners, I rely on left hand drill bit sets because they often help loosen the problem while drilling. I like that these bits rotate in the opposite direction of standard drill bits, which can sometimes back out a fastener before I even need an extractor. In my experience, they are especially useful for repair jobs where I want to minimize damage to the surrounding material.

What I Look for Before Buying

Before I choose a set, I always check the material, size range, and overall quality. I prefer high-speed steel or cobalt bits because they tend to hold up better under pressure and heat. I also look for a set that includes the sizes I use most often, so I am not stuck with gaps in the middle of a job.

Bit Material and Durability

For me, durability matters a lot. I usually choose bits made from HSS, M35, or M42 cobalt because they handle harder metals better and stay sharp longer. If I expect heavy use, I avoid cheaper sets that may dull quickly or snap under stress. A stronger bit saves me time and frustration in the long run.

Size Range and Set Variety

I always check whether the set offers a practical range of sizes. A good left hand drill bit set should cover small precision work as well as larger extraction jobs. I find that a complete and well-organized set makes my work smoother because I can move from one size to another without wasting time searching for the right bit.

Shank Type and Compatibility

I make sure the shank fits my drill or drill press before buying. Most of the time, I look for standard round shanks that are easy to use with common drill chucks. If the bits do not fit my equipment properly, even the best set becomes inconvenient.

Cutting Performance

In my experience, sharp cutting edges and accurate grinding make a big difference. I want bits that drill cleanly and bite well into metal without wandering. Good cutting performance helps me remove broken fasteners faster and reduces the chance of damaging the workpiece.

Storage Case and Organization

I prefer sets that come in a sturdy case with clearly labeled sizes. A reliable storage case keeps my bits protected and helps me stay organized in the shop or on a job site. When the bits are easy to identify, I work faster and lose fewer tools.

Best Uses I Recommend

I find left hand drill bit sets most useful for removing broken bolts, drilling out seized screws, and working on automotive repairs. They are also handy in machinery maintenance and metalworking projects. Whenever I expect a fastener to be stubborn, I keep one of these sets nearby.

My Final Buying Advice

If I were choosing a left hand drill bit set today, I would focus on quality first, then size range, and finally storage and convenience. A dependable set can save a repair job, especially when a broken fastener is causing trouble. For me, investing in a better set is always worth it because it performs better and lasts longer.

Final Thoughts

I’ve found that left hand drill bit sets are a smart addition to any toolbox, especially when I need to remove broken fasteners or work on stubborn repairs. My key takeaway is that the right set can save time, reduce frustration, and help prevent further damage to the material. I think choosing a quality set with the right sizes and durability makes all the difference for reliable results.

Author Profile

Thomas Calder
Thomas Calder
Thomas Calder is a desktop support and technology procurement specialist based in Grand Rapids, Michigan. Her work has taught her that the best technology is rarely the flashiest option. It is the one that fits smoothly into everyday life.

After years of helping coworkers, friends, and family choose devices, solve frustrating problems, and avoid unnecessary upgrades, she started FuzoTech in 2026.

Thomas writes honest, practical reviews shaped by real use, careful comparison, and a strong dislike of confusing setup, hidden costs, and products that create more trouble than they solve.