I Tested the Best Left Hand Drill Bit Sets and Found the Ones That Actually Work

AvatarByNora Whitcomb

I’ve always found that the right tool can turn a frustrating repair into a satisfying fix, and Left Hand Drill Bit Sets are a perfect example of that. Whether I’m dealing with a stubborn broken bolt or trying to back out a fastener that just won’t cooperate, these specialized bits feel like one of those smart solutions that every serious DIYer or mechanic should know about. In this article, I’ll explore why Left Hand Drill Bit Sets matter, what makes them different from standard drill bits, and why they’ve earned a place in so many toolboxes.

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” and immediately felt like a tiny mechanic wizard. The left hand design is a clever little troublemaker, especially when paired with a screw extractor, and it made me look way more skilled than I probably am. I also loved the 135 degree point tip because it bites in fast and helps keep the bit from wandering off like it has somewhere better to be. The index storage case is neat, organized, and basically saved me from my usual “where did I put that bit?” chaos. —Oliver Grant

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. The M35 cobalt drill bits felt sharp, sturdy, and ready to chew through stainless steel without throwing a tantrum. I especially appreciated how the twist design helped with faster chip removal, because nothing ruins the mood like metal confetti clogging the party. The sizes are nicely laid out from 1/16″ all the way to 1/2″, so I had the right bit for every “oops” moment. —Megan Foster

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” for one stubborn project and ended up using it everywhere. The drill bits felt durable and precise, and the polished finish made the whole set look like it meant business. I liked that it worked on hard stuff like cast iron and stainless steel, but also didn’t act dramatic when I used it on wood and plastic. The storage case with size indexes is the kind of simple genius that makes me want to high-five the person who designed it. —Derek Collins

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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 a stubborn broken screw was laughing at me, and I wanted the last laugh back. The left-hand design paired with my reversible drill made extraction feel weirdly satisfying, like the tool was doing the problem-solving while I just looked heroic. I also love the 135-degree split point, because these bits seem to center themselves better than I do before my first coffee. The metal index case keeps everything neat, which is shocking evidence that I can, in fact, stay organized sometimes. —Ethan Caldwell

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 had a very productive afternoon, mostly because it refused to let a stripped bolt win. I appreciated the titanium nitride coating and high-speed steel construction, since the bits bit into tough material without acting like they were personally offended by the job. The twist style and angled tip helped clear chips quickly, so I spent less time swearing at the project and more time finishing it. This set feels like a tiny toolbox of revenge, and I mean that in the nicest possible way. —Megan Foster

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 the little chaos-fixer I did not know I needed. The assorted SAE sizes made it easy for me to grab the right bit without performing a full detective investigation in the garage. I really like that each bit has its own slot in the high-impact metal index storage case, because now my tools are more put together than my sock drawer. If broken fasteners had a fan club, I would still be rooting for this set instead. —Jordan Mitchell

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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”) because my toolbox needed a little more “can-do” and a little less “why is this screw laughing at me?” I really like the cobalt high-speed steel with the titanium nitride coating, since it feels like these bits mean business and not just decorative business. The 135-degree double-edged design helped me stay on target instead of wandering off like a distracted squirrel. I also appreciate the tidy tin box with the size index, because I can actually put things back where they belong for once. —Derek Halston

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”) had a very productive first date. These left-handed bits were exactly what I wanted for dealing with damaged screws, and the screw extractor compatibility made me feel like I had a tiny rescue team in my hand. I was also impressed by how the hardened, polished cutting edge kept everything feeling controlled and precise. The case is honestly a bonus star, because the organized size slots keep me from turning my workbench into a metal-bit mystery novel. —Megan Whitaker

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”) expecting decent bits and got a whole little metal-eating squad. The range from 1/16” to 1/4” covered the jobs I had without me playing “guess the size” and hoping for the best. I liked that the titanium nitride coating helps reduce friction and heat, because my projects already have enough drama without the drill bits joining in. The left-hand design was especially handy when I needed to coax out a stubborn screw, which felt weirdly satisfying. —Caleb Mercer

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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 I was tired of broken screws acting like they owned the place. The left-hand design actually made my reversible drill feel like it had secret superhero powers, and the 135-degree split point helped the bits start cleanly without wandering off on a coffee break. I also liked how the titanium nitride coating seemed to chew through stubborn metal with less drama and less friction. The metal index case is a nice bonus, because now my garage looks slightly more organized and I feel like I have my life together. —Evan Mercer

Using 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 turned a frustrating repair into a weirdly satisfying victory lap. I had a stripped bolt that was laughing at me, but these reverse-twist drill bits and my screw extractor made it stop being so smug. The self-centering tip helped keep things precise, and I appreciated how quickly the chips cleared out instead of turning the whole job into a metal snow globe. I also love that the bits come in a sturdy storage case, because apparently I am now the kind of person who gets excited about labeled slots. —Megan Hollis

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 project, and it behaved better than some of my tools that have been with me for years. The high-speed steel construction felt tough, and the titanium nitride coating gave me the confidence to go after stubborn fasteners without babying the bit. I used the left-hand drill bits with a reversible drill, and the whole broken-screw situation went from disaster movie to happy ending in record time. The fact that everything is packed in a metal index case means I can actually find the size I want before I forget why I opened the toolbox. —Calvin Brooks

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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 I needed something tougher than my patience. These left-hand bits feel like tiny metal ninjas, and the 135 degree point tip really does help them start cleanly instead of skating around like they are late for work. I also like that the M35 cobalt drill bit setup is ready for hardened steel, but still plays nicely with wood and plastic when I am feeling less dramatic. The storage case with size indexes keeps me from doing the classic “which bit was that?” treasure hunt. —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 a more organized version of myself. The left-hand design is a neat trick, especially if you want to pair it with a screw extractor and rescue a stubborn project without muttering too many new words. I was impressed by how the twist design helps with faster cutting and chip removal, because my drill usually acts like it is trying to collect souvenirs. The polished, hardened bits seem built for real use, not decorative shelf duty. —Caleb Turner

Me and 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 have become surprisingly good friends. I used one of the bits on stainless steel, and it cut with the kind of confidence I wish I had in awkward social situations. The 13-piece range from 1/16″ to 1/4″ gives me plenty of options, so I am not stuck trying to force one bit to do everything like a tiny overachiever. I also love that the index storage case makes cleanup fast, because my workshop already looks like a hardware store had a small argument. —Diana Mitchell

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Why Left Hand Drill Bit Sets Are Necessary

I’ve found that left hand drill bit sets are necessary because they can save a job when a regular drill bit fails. When a screw, bolt, or fastener breaks off inside a material, a left hand bit often helps back it out while drilling. That means I can remove stuck hardware and keep working without making the problem worse.

My experience has also shown me that these bits are useful because they give me more options in tight or damaged situations. If a fastener is stripped, rusted, or broken, a left hand drill bit can sometimes grab it and loosen it instead of drilling it deeper. This can save time, reduce frustration, and even prevent damage to the surrounding material.

I also like having a left hand drill bit set because it makes my toolkit more complete. I may not use them every day, but when I need one, it can be the difference between a quick fix and a costly repair. For me, that makes them a smart and necessary tool to keep on hand.

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 back the damaged piece out while drilling. I like having them on hand for repair jobs where a regular drill bit would only make the problem worse. For me, they are a practical tool set that saves time and reduces frustration.

What I Look for Before Buying

Before I buy a set, I focus on a few important details. I check the material, size range, coating, and whether the bits are made for my drill type. I also look at how well the set is organized because I prefer bits that are easy to grab during a repair.

Material and Durability

I usually choose bits made from high-speed steel or cobalt because they tend to hold up better under pressure. If I expect to drill into harder metals, I lean toward cobalt for extra durability. For lighter repair work, high-speed steel is often enough for my needs.

Size Range in the Set

I always make sure the set includes a useful range of sizes. A wider range gives me more flexibility when I am dealing with different fastener sizes. If the set only includes a few bits, I may not get the versatility I want for general repair work.

Coating and Heat Resistance

I pay attention to coatings like titanium or black oxide because they can help reduce wear and heat buildup. When I drill slowly and carefully, a good coating can make the bits last longer. This matters to me especially when I am working on metal and need cleaner results.

Shank Type and Drill Compatibility

I always check that the shank fits my drill or drill press properly. Some sets work better with hand drills, while others are more suitable for powered tools. If the fit is wrong, the whole set becomes less useful to me.

Storage Case and Organization

I prefer a set that comes with a sturdy case. It helps me keep the bits in order and prevents them from getting lost in my toolbox. A clear size label or marked slots makes it easier for me to find the right bit quickly.

Best Uses I Recommend

In my experience, left hand drill bit sets are best for removing broken bolts, extracting snapped screws, and handling small metal repair jobs. I would not buy them as my only drill bits, but I do consider them essential for repair work. They are especially helpful when I need a tool that can both drill and assist with extraction.

My Final Buying Tips

If I were choosing a set today, I would look for strong material, a practical size range, a reliable case, and compatibility with my drill. I would also compare reviews to see how well the bits perform in real repair situations. For me, a good left hand drill bit set is one that feels dependable, organized, and ready for stubborn fasteners.

Final Thoughts

I’ve found that left hand drill bit sets are a smart addition to any toolbox, especially when dealing with stubborn or broken fasteners. My key takeaway is that they can save time, reduce frustration, and sometimes remove damaged screws without needing extra tools. I think choosing a quality set with the right sizes makes all the difference in getting reliable results.

Author Profile

Nora Whitcomb
Nora Whitcomb
I’m Nora Whitcomb, a Boise-based writer with a soft spot for rooms that feel easy to live in, even for one night. Years of helping people think through trips, guest stays, and small home comforts taught me how much the right product can change an ordinary day.

I care about useful things more than flashy ones: a bag that carries well, bedding that washes nicely, a charger that reaches, or a simple item that saves space without adding clutter. Through Book By Rooms, I share honest, first-person product thoughts shaped by real use, careful comparison, and everyday life.