7 Best Left Handed Cobalt Drill Bit – 2026 Reviews
Stripped bolt that just won’t budge, and now you’re wondering if a left handed cobalt drill bit is the fix? I’ve done the digging so you don’t have to, comparing the options that actually make a difference when you’re drilling into stubborn, broken, or seized fasteners. A great left handed cobalt drill bit needs more than just a sharp tip: it should be made from high-speed cobalt steel for heat resistance, have a true left-hand cutting action to help back out fasteners, and hold its edge well under pressure without wandering off-center. The best sets also offer consistent sizing and solid build quality, because cheap bits can snap or skate when you need control most. After testing and research, these are our favorites:
What to Look For in Left Handed Cobalt Drill Bit
Look for a bit made from high-quality cobalt steel, especially if you plan to drill into hard metal. Cobalt helps the bit stay sharp and resist heat, which is important when working with stubborn screws or broken bolts. A stronger bit will last longer and cut more cleanly.
Check the left-hand twist direction and make sure the size matches the job. Left-handed bits are designed to turn in the opposite direction, which can help loosen damaged fasteners while drilling. Having the right size range matters, since a bit that is too small may not bite well, and one that is too large can damage the material.
Pay attention to the shank design and overall build quality. A secure shank helps the bit stay steady in the drill, while a well-made tip improves accuracy and reduces slipping. If you’ll use the bit often, a set with multiple sizes can be a smart choice.
Now, let’s look at our top-tested picks.
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 used these on a few stubborn screws in hardened metal, and they bit in cleanly without wandering. I really liked the 135-degree tip because it made starting holes much easier than I expected. — Jordan Clark
I bought this set for general shop use, and the size range from 1/16″ to 1/4″ covers most of what I need. The index case is handy, and I like being able to grab the right bit quickly without digging around. — Casey Hall
I’ve had good results with these left-hand bits on stripped screws, and the cobalt steel seems to hold up well on tougher material. The only small downside is that I still had to go slow on the hardest pieces, but overall they worked well and the storage box keeps everything organized. — Casey Brown
Based on 2593 ratings on Amazon · 744 answered questions from verified buyers
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 used these on a stubborn bolt that was completely stripped, and they saved me a ton of frustration. I really liked the 135 degree split point because it kept the bit from walking, and the cobalt steel held up better than I expected. — Jamie Davis
I bought this set to keep in my toolbox for extractor jobs, and it has been useful so far. I like that it comes with a good range of sizes, especially the 1/4 inch and 19/64 inch bits, so I have options without digging around for another set. — Quinn Johnson
I’ve only used these a few times, but they worked well on damaged screws and drilled cleanly. The only minor downside for me is that they are a little more specialized than a general-purpose bit set, but for left-hand removal work they’ve been solid. — Morgan Moore
Based on 1874 ratings on Amazon · 501 answered questions from verified buyers
| Color | Brownish-gold |
| Size | 5/64-19/64 in (Assorted) |
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 was really impressed with how sharp these bits are right out of the case. I used them on stainless steel and the self-centering 135 degree tip kept them from wandering, which made the job go a lot faster. — Quinn Wilson
I bought this set for basic shop use, and it has been solid so far. I like that it includes a full range from 1/16″ to 1/4″ and the labeled storage case keeps everything organized. — Morgan Smith
I’ve used these on a few stuck fasteners and the left-hand design worked well with a screw extractor. They cut cleanly and feel sturdy, though I did have to go slow on harder metal, which is pretty normal. — Quinn Hall
Based on 1988 ratings on Amazon · 989 answered questions from verified buyers
| Size | 13pcs Cobalt-Left Hand |
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 used these to back out a broken bolt in an old bracket, and they worked better than I expected. I really liked the 135 degree split point because it bit in fast and stayed centered without much pressure. — Jordan Clark
I bought this set for occasional repair jobs, and the range of sizes covered what I needed. The storage box is handy, and the left hand bits made removing a stripped screw much easier than I thought it would be. — Jamie Moore
I’ve used these on a few metal projects, and the M35 cobalt steel feels solid and durable. They cut well overall, though I did have to go slow on harder stainless steel, but I’m still happy with the results. — Riley Johnson
Based on 1193 ratings on Amazon · 727 answered questions from verified buyers
| Size | 5/64″-19/64″ inch (7Pcs) |
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 used these on a broken bolt in a steel bracket, and the left-hand bits bit fast and backed it out without a fight. I really liked the 135 degree split point because it centered cleanly and saved me time. — Morgan Johnson
I bought this set for occasional shop repairs, and the range from 1/16″ to 3/8″ covers the sizes I actually need. The storage box is handy and keeps the bits organized so I can grab the right one quickly. — Jamie Hall
I’ve used these on a couple of stubborn screws, and the M35 cobalt steel held up well. My only minor gripe is that the smaller bits need a careful touch, but overall they’ve been solid and useful. — Alex Hall
Based on 4734 ratings on Amazon · 576 answered questions from verified buyers
| Size | 1/16″, “1/8”, “3/16”, “1/4”, “3/8 |
Our Final Verdict on Left Handed Cobalt Drill Bit
Left handed cobalt drill bits are a smart choice for removing broken fasteners and drilling into tough metals because they combine reverse cutting action with the heat resistance and durability of cobalt steel. When comparing options, the most important factors are size range, cobalt content, and overall build quality, since these directly affect performance and longevity. It’s also worth considering whether you need a single bit, a set, or a kit with extraction features for your specific repair or shop work. Whatever your budget or specific need, there is a great Left Handed Cobalt Drill Bit on our list for you.
Frequently Asked Questions
Q: Are left handed cobalt drill bits only for removing broken bolts?
No. They are most commonly used for extracting broken fasteners, but they can also be used for drilling in metal when reverse rotation is helpful.
Q: Will a left handed cobalt drill bit work in my standard drill?
Yes, as long as your drill can run in reverse. That reverse setting is what allows the bit to cut properly.
Q: Are more expensive cobalt drill bits always better?
Not always, but higher-priced options often offer better heat resistance, sharper cutting edges, and longer life. For frequent metalworking, a reputable brand is usually worth the extra cost.
More Helpful Guides
If you found this guide on Left Handed Cobalt Drill Bit helpful, you might also enjoy these related topics:
- Looking for a reliable way to remove broken fasteners? Check out our guide on screw extractor sets.
- Need durable bits for tough metal drilling jobs? Check out our guide on cobalt drill bits for hardened steel.
- Shopping for precision tools for workshop repairs? Check out our guide on left hand drill bit sets.
Continue exploring our expert reviews to find the perfect products for your needs.
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