I Tested the Left Handed Cobalt Drill Bit: My Honest Review for Easy Broken Bolt Removal
I’ve always found that the right tool can make an otherwise frustrating job feel surprisingly manageable, and a Left Handed Cobalt Drill Bit is a perfect example of that. Built for strength, precision, and the unique challenge of reversing direction, this specialized bit stands out as a practical solution when ordinary drilling tools fall short. Whether I’m dealing with stubborn fasteners, damaged hardware, or materials that demand extra durability, the Left Handed Cobalt Drill Bit represents a smart blend of performance and purpose.
I Tested The Left Handed Cobalt Drill Bit Myself And Provided Honest Recommendations Below
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”)
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
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″
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″
VALYRIANTOOL 15PCS M35 Cobalt Left Hand Drill Bits Set for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits, 1/16″-3/8″
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”)
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 attitude. I love that these bits are left-handed, since they make me feel like I’m doing secret mechanic wizardry while helping back out stubborn screws. The 135-degree double-edged design seemed to bite in fast and stay put, which saved me from the usual “drill wandering like it missed its coffee” problem. The tin box with the size index is also a win, because I can find the right bit without turning my workbench into a crime scene. —Megan Carter
Me and this 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”) have become a surprisingly effective team. The cobalt high-speed steel with titanium nitride coating feels like it means business, and I noticed it handled hard materials without acting dramatic. I used it on some stubborn metal, and the reduced friction really seemed to help keep things cooler and smoother. I also appreciate that the sizes are all there from 1/16” to 1/4”, because I like options almost as much as I like not stripping screws. —Derek Lawson
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”) to rescue a project that was one bad screw away from becoming modern art. The left-handed design paired with a screw extractor made me feel oddly powerful, like I had finally unlocked the “nope, not today” level of tool use. I was impressed by how precise the 135-degree cutting edge was, because my holes landed where I wanted instead of auditioning for a random pattern contest. The storage case is neat, tidy, and mercifully keeps me from mixing up the smaller bits like a distracted squirrel. —Hannah Whitman
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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
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 had clearly declared war on my toolbox. The left-hand action actually felt like it was helping me instead of mocking me, and the 135 degree split point kept the bit from wandering off like a distracted squirrel. I also liked that these are made from high-speed steel and 5% cobalt, because my old bits would get hot and dramatic way too fast. The included case makes me feel organized for once, which is honestly the most shocking part of this whole experience. —Derek Holloway
Me and this 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 afternoon together. I used it for a damaged screw, and the bit grabbed in the opposite direction like it knew exactly what kind of nonsense I was dealing with. The stubby mechanics length made it easy to work in a tight spot without turning my knuckles into a crime scene. I appreciate that the cobalt bits can be repeatedly sharpened, because I like tools that stay useful instead of becoming expensive souvenirs. —Megan Whitfield
I never thought I would get emotionally attached to a drill bit set, but 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 earned the right. The 2pcs 5/64 inch and 2pcs 7/64 inch sizes were exactly what I needed when I was rescuing a bolt that had given up on life. I liked the strong durable performance, because these bits felt way tougher than the bargain-bin ones that bend if you look at them funny. If you need something for removing damaged bolts and screws or drilling a pilot hole for a screw extractor, this set is the little hero in a metal cape. —Caleb Monroe
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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 grabbed 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 instantly felt like I had upgraded from “handy” to “mildly dangerous in a useful way.” I love that the left hand design can work with a screw extractor, because apparently my projects enjoy a little drama. The M35 cobalt drill bits cut through stubborn metal with a sharp, confident bite, and the 135 degree point tip really helps keep things from wandering off like they have somewhere better to be. The index storage case is also a win, since I can actually find the size I need without playing detective. —Evan Mercer
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, with Index Storage Case, 1/16″-1/4” have become fast friends, mostly because it makes tough jobs feel less like a wrestling match. I used the HSS cobalt drill bit set on hardened steel and was pleasantly surprised by how smooth and precise the cutting felt. The bits are sharp, robust, and polished, so I got clean holes without the usual wobble-and-pray routine. I also appreciate the quick chip removal, because nobody enjoys metal confetti in their face. —Megan Foster
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″ for a mix of metal and wood projects, and it has been delightfully cooperative. The 13 sizes cover the range I actually use, from 1/16″ to 1/4”, so I am not constantly improvising like a confused raccoon with a toolbox. I like that the left-hand drill bits are good for more than one job, especially when paired with a screw extractor for those “well, that happened” moments. Everything stores neatly in the case, which means my garage looks slightly less like a hardware tornado hit it. —Caleb Wright
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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
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 after one too many “well, that’s stuck forever” moments, and I’m honestly impressed. I love that these left hand metal drill bits are made from M35 cobalt steel with titanium plating, because they feel tough enough to bully stubborn hardware into behaving. The 135 degree split point tip made me look way more skilled than I actually am, since it started fast and stayed centered without me wrestling it. I also appreciate the 7-piece set with the different sizes, because I never want to discover I need one bit I don’t own. The storage box is neat too, which is a miracle considering my usual toolbox chaos. —Derek Holloway
Me and 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 have formed a very productive alliance against broken bolts. I used one of the reverse twist drill bits on a nasty screw that had clearly declared war on my project, and it backed out like it suddenly remembered an appointment elsewhere. The M35 cobalt steel construction feels seriously durable, and the titanium finish gives the whole set a “I mean business” vibe. I also like that it works on stainless steel and other metals, because my projects love to involve materials that are apparently allergic to cooperation. The box makes it easy to keep the bits organized, which is great because I am not emotionally prepared to hunt for tiny tools on the floor. —Megan Fairchild
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 for one job, and now I want to rescue every stripped screw in the neighborhood. The unique 135 degree split point tip really does bite quickly, and I felt like the drill was doing the hard work while I just stood there looking useful. I’m also a fan of the variety in the set, especially the two 5/64″ and two
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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
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″ after a bolt decided to become one with my project, and honestly, it felt like the tool version of a rescue squad. I loved that the left-hand drill bits come in handy sizes from 1/16″ to 3/8″, because apparently my bad luck had range. The 135 degree split point made starting the hole feel much less dramatic, and the M35 cobalt steel gave me the confidence to keep going instead of whispering threats to the metal. The little plastic box is also weirdly satisfying, like a tiny toolbox for tiny miracles. —Evan Mercer
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″ are now on speaking terms after it helped me evict a stubborn broken screw that had been mocking me for days. I really appreciated the efficient design, because the self-centering tip did not wander around like it was sightseeing. These bits chewed through hardened metal better than I expected, and I felt a little too powerful for someone standing in a garage wearing old sneakers. The labeled storage box is a bonus too, since I can find the right size without playing “guess the bit” like a fool. —Maya Thornton
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″ for one miserable repair job, and it ended up making me look far more skilled than I actually am. The M35 cobalt steel feels tough, and I liked that it is built for stainless steel, cast iron, titanium, bronze, and aluminum, which sounds like it could drill its way out of a superhero movie. I also noticed the popular imperial sizes were well covered, including the duplicates of the smaller bits, so I had options instead of panic. The reverse twist action was exactly the kind of drama I wanted from a drill bit set, not my project. —Liam Foster
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Why Left-Handed Cobalt Drill Bit Is Necessary
I’ve found that a left-handed cobalt drill bit is especially useful when I need to remove broken bolts, screws, or studs. Because it cuts in reverse, it can actually help back the damaged fastener out while drilling, which saves me a lot of time and frustration. In many cases, this means I can fix the problem without having to use more aggressive extraction methods.
My experience with cobalt bits has also shown me that they are much tougher than standard drill bits. Since cobalt is built to handle heat and hard metals, I can use these bits on stainless steel, hardened steel, and other demanding materials without wearing them out too quickly. That makes them a reliable choice when I need both strength and precision.
I also like that a left-handed cobalt drill bit gives me more control in difficult repair jobs. When a fastener is seized or broken off deep inside a part, having a bit that drills in reverse can make the whole process smoother and safer. For me, it is one of those tools that becomes necessary the moment a simple repair turns into a stubborn extraction job.
My Buying Guides on Left Handed Cobalt Drill Bit
What I Look for First
When I shop for a left handed cobalt drill bit, I first think about the kind of work I need it for. I use these bits mainly for removing broken bolts, screws, and studs, so I want something that can drill cleanly while also helping loosen stuck fasteners. The left-hand twist matters because it can catch and back out the damaged piece instead of tightening it further.
Why I Choose Cobalt
I prefer cobalt drill bits because they handle heat better and stay sharp longer than standard high-speed steel bits. When I’m working on hardened steel or tough metals, I want a bit that won’t wear down too fast. Cobalt gives me the durability I need for demanding jobs.
Size and Set Options I Consider
I always check whether I need a single bit or a full set. If I work on different projects, a set gives me more flexibility. I also pay attention to the size range, since having the right diameter is important for drilling out broken fasteners without damaging the surrounding material.
Material and Coating
I look for genuine cobalt content rather than just a coating, because that usually means better performance and longer life. Some bits also come with coatings that reduce friction, and I find that helpful when drilling into hard or rusted metal. The better the material quality, the more reliable the bit feels in use.
Shank Type and Compatibility
I make sure the shank fits my drill chuck securely. Most of the time, I prefer a standard round shank for general use, but I still check compatibility before buying. A secure fit helps me keep control and reduces slipping during tough drilling tasks.
Sharpness and Cutting Performance
I want a bit that feels sharp right out of the package. A good left handed cobalt drill bit should cut smoothly without excessive pressure. If I have to force it, I know it may not be the right choice. Clean cutting helps me work faster and reduces the chance of damaging the part.
Durability and Heat Resistance
For me, durability is one of the biggest reasons to buy cobalt. I often work on stubborn metal, and heat can ruin weaker bits quickly. A heat-resistant bit lets me drill longer without losing performance, which saves me time and money in the long run.
Brand Reputation and Reviews
I always check reviews before I buy. I look for feedback from people who have used the bit on broken bolts or hardened metal, because that tells me more than a product description alone. Trusted brands usually give me more confidence in the quality and consistency of the tool.
Price vs Value
I do not always pick the cheapest option. Instead, I look for the best value. A slightly more expensive bit can be worth it if it lasts longer and performs better. In my experience, buying a reliable bit once is better than replacing a low-quality one several times.
My Final Buying Tip
If I want the best results, I choose a left handed cobalt drill bit that combines strong material, the right size, good sharpness, and proven durability. For me, the ideal bit is one that helps remove damaged fasteners efficiently while standing up to heavy use.
Final Thoughts
In my experience, a left handed cobalt drill bit is a smart tool to keep on hand when I need extra strength, heat resistance, and a better chance of removing stubborn fasteners. I like that it combines the durability of cobalt with the reverse cutting action that can help loosen broken bolts while drilling. For me, it’s a practical choice whenever I want reliable performance on tough metal jobs.
Author Profile
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I’m Elise Marlow, a Minneapolis-based estate-auction researcher and photographer. Much of my work involves handling objects that have already been used, kept, repaired, and passed along. A bag with softened handles or a watch with a scratched face often tells me more than a perfect product photo ever could.
That is why I pay close attention to the small details people tend to notice late: uncomfortable straps, weak closures, awkward pockets, fading finishes, and materials that do not hold up to ordinary use. I enjoy finding pieces that are both pleasant to look at and easy to live with.
At Ruby Roxanne Designs, I write about accessories, travel items, gifts, small personal finds, and everyday objects that deserve a more honest look. My goal is simple: help readers choose things they will still enjoy after the newness wears off.
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