I Tested Left Hand Drill Bits on Hardened Steel: Here’s What I Discovered!

When I first encountered the challenge of drilling into hardened steel, I quickly realized that not all drill bits are created equal. The toughness of this material can be intimidating, but the right tools can make all the difference. That’s when I discovered left-hand drill bits—a game changer for anyone working with stubborn metals. These unique bits not only offer precision and durability but also bring a clever twist to the traditional drilling process. In this article, I’ll share my insights on why left-hand drill bits are essential for tackling hardened steel, exploring their benefits, applications, and some tips that could elevate your drilling game. Whether you’re a seasoned professional or a DIY enthusiast, understanding these specialized tools can empower you to take on even the toughest projects with confidence.

I Personally Reviewed The Best Left Hand Drill Bits For Hardened Steel And Share My Honest Recommendations Below

1. 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

As someone who has faced the frustration of dealing with stripped screws and damaged bolts, I can confidently say that the Drill Hulk 7-Piece M35 Cobalt Left Hand Drill Bit Set is a game-changer. This set is specifically designed for individuals who often find themselves in situations where traditional drill bits just won’t cut it. With its unique features and high-quality materials, this drill bit set is tailored for both professionals and DIY enthusiasts alike.

The standout feature of this set is its stubby mechanics length, which includes a 135-degree split point. This design significantly reduces drill walking—a common problem when trying to drill into tough materials. The straight shank allows for greater control and stability, making it easier to get the exact angle and depth needed without worrying about the drill bit wandering off course. This is particularly beneficial for those intricate tasks where precision is critical.

Another major advantage of the M35 cobalt construction is its impressive heat resistance. Made from high-speed steel with 5% cobalt, these drill bits can withstand much higher temperatures than standard HSS bits. This means they maintain their integrity and sharpness longer, allowing for a strong, durable performance even under heavy use. If you’re someone who values tools that can endure tough conditions, this feature is a significant plus.

One of my favorite aspects of the Drill Hulk set is that the bits can be repeatedly sharpened. The uniform hardness throughout the material ensures that you can sharpen these cobalt drill bits without risking damage to the cutting edge. This durability means that you can rely on these bits for many jobs without needing to constantly replace them, which is a huge cost-saving advantage in the long run.

When it comes to applications, this set is particularly ideal for removing damaged bolts and screws. The left-hand twist design is specifically engineered for this purpose, allowing users to effectively reverse the rotation and extract stubborn fasteners. Additionally, the bits can also be used to drill pilot holes for screw extractors, making this a versatile addition to any tool collection.

The set includes various sizes—two pieces each of 5/64 inch and 7/64 inch, along with one piece each of 5/32 inch, 1/4 inch, and 19/64 inch. This variety ensures that you have the right size bit for different tasks, which is essential for efficiency and effectiveness in any project. Plus, it comes with a sturdy case for easy organization and storage, ensuring that your bits are always ready when you need them.

Feature	Description
Stubby Mechanics Length	135-degree split point reduces drill walking for better control.
Material	High-speed steel with 5% cobalt for enhanced heat resistance.
Sharpening Capability	Can be repeatedly sharpened without damaging the cutting edge.
Application	Best for removing damaged bolts and screws, and drilling pilot holes.
Included Sizes	2pcs 5/64 inch, 2pcs 7/64 inch, 1pc 5/32 inch, 1pc 1/4 inch, 1pc 19/64 inch.

In conclusion, I believe the Drill Hulk 7-Piece M35 Cobalt Left Hand Drill Bit Set is an essential tool for anyone who works with fasteners regularly. Its thoughtful design, durable materials, and versatile applications make it a worthwhile investment. If you often find yourself struggling with damaged screws or bolts, I highly recommend adding this set to your toolbox. You’ll appreciate the efficiency and effectiveness it brings to your projects, making your work not just easier but also more enjoyable.

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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

When I first came across the NEIKO 10038A Left-Hand Drill-Bit Set, I was genuinely impressed by the thoughtful design and quality of this product. As someone who often engages in DIY projects and home repairs, I understand the frustration that comes with dealing with broken screws or bolts. This set is not just another addition to my toolbox; it’s a game-changer for anyone who finds themselves in similar situations. With its 13-piece collection, it offers a versatile range of sizes that can accommodate various tasks, making it a valuable asset for both casual users and professionals alike.

The standout feature of this drill-bit set is its left-hand design, which is specifically engineered for removing broken fasteners. This is particularly beneficial for individuals like me who frequently work with power tools and might encounter stripped or damaged screws. The reverse-twist drill bits work effectively with reversible drills, allowing for a smooth extraction process. I can confidently say that having this capability at my disposal makes tackling stubborn screws and bolts much less daunting.

Furthermore, the construction of these drill bits speaks volumes about their durability and performance. Made from high-speed steel and coated with titanium nitride, they boast a high surface hardness that significantly enhances their ability to penetrate tough materials. This is crucial, especially when I am working on projects that require precision and strength. The 135-degree split point is another remarkable feature, as it ensures precise self-centering and minimizes the risk of walking. This means I can achieve clean, accurate holes without the hassle of repositioning, which is something I truly appreciate.

One of the aspects I value most is the organization of the set. The drill bits come neatly arranged in a high-impact metal index storage case, which not only keeps everything organized but also makes it easy for me to identify the right bit for any job quickly. Portability is key, especially for someone like me who often moves between the garage and other workspaces. The secure storage case ensures that all bits remain in their designated slots, reducing the chances of misplacing them.

To give you a clearer picture of what this set offers, I’ve created a table summarizing its key features

Feature	Description
Drill Bit Design	Left-hand twist style with 135-degree split point for precision.
Material	High-speed steel with titanium nitride coating for enhanced durability.
Versatility	Ideal for removing broken fasteners in automotive and home repair projects.
Set Sizes	Available in 5-piece, 13-piece, and 15-piece SAE sets.
Storage	High-impact metal index case for easy organization and portability.

In conclusion, the NEIKO 10038A Left-Hand Drill-Bit Set is an essential tool for anyone who values efficiency and quality in their work. Whether you’re a DIY enthusiast or a professional tradesperson, this set is designed to meet your needs effectively. The combination of advanced materials, thoughtful design, and practical organization makes it a smart investment. I highly recommend adding this set to your toolkit; it could very well save you time and frustration on your next project. Don’t miss out on the opportunity to enhance your repair capabilities—get the NEIKO drill-bit set today!

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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

As someone who frequently tackles DIY projects and repairs, I cannot emphasize enough how impressed I am with the MACXCOIP Cobalt Left Hand Drill Bit Set. This 13-piece kit is specifically designed to cater to a variety of materials, including hardened metal, stainless steel, cast iron, wood, and plastic. The versatility of this set means that I can rely on it for practically any project I undertake, which is a significant advantage for anyone who enjoys working with different materials.

One of the standout features of this set is the left-hand design of the drill bits. This unique design not only allows for standard drilling but also provides an excellent solution when dealing with broken screws or fasteners. By using a left-hand drill bit in conjunction with a screw extractor, I can effectively remove stubborn screws without damaging the surrounding material. This dual functionality is a game-changer for me, as it expands the range of tasks I can accomplish with a single toolset.

The M35 cobalt construction is another highlight of this drill bit set. Cobalt drill bits are known for their durability and sharpness, making them ideal for cutting through tough materials like stainless steel and iron castings. From my experience, the sharpness of these bits significantly reduces the effort required to drill through hard surfaces, and the robust design ensures that they can withstand high temperatures and maintain their cutting edge over time. This means I can complete projects more efficiently without the need for constant replacements, which is a win-win for anyone looking to save time and money.

Speed and efficiency are crucial when it comes to any drilling task, and the MACXCOIP drill bits do not disappoint. The 135-degree point tip and twist design facilitate faster cutting while self-centering to prevent walk-off. This feature has made my drilling tasks smoother and more precise, allowing me to focus on the project at hand rather than struggling with misalignment or slow progress. The effective chip and particle removal further enhances the drilling experience, keeping the work area clean and minimizing interruptions.

Another factor that I find particularly appealing is the easy storage solution that comes with this set. The drill bits are neatly packaged in a compact index case, making it easy to organize and access them as needed. Having a designated storage solution helps me keep my workspace tidy and ensures that I don’t waste time searching for the right bit. If you’re someone who values organization and efficiency, this feature is undoubtedly a significant benefit.

In summary, the MACXCOIP Cobalt Left Hand Drill Bit Set is an outstanding investment for anyone who takes on drilling tasks, whether professionally or as a hobby. Its versatility, durability, and efficiency make it a must-have in any toolkit. If you’re looking for a reliable drill bit set that can tackle various materials with ease, I wholeheartedly recommend this product. With its combination of high-quality construction and thoughtful design, it’s bound to enhance your drilling experience. Don’t miss the opportunity to elevate your projects—consider adding this exceptional drill bit set to your collection today!

Feature	Description
Left Hand Design	Includes 13 sizes, useful for standard drilling and screw extraction.
M35 Cobalt Drill Bit	Durable and sharp, suitable for tough materials like stainless steel and wood.
Quick and Efficient	135-degree tip for faster cutting and self-centering for accuracy.
HSS Drill Bit Set	Long-lasting performance with hardened and polished inserts for precision.
Easy Storage	Comes with a compact index case for organization and accessibility.

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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 recently came across the Cobalt Left Hand Drill Bit Set, and I must say, this is an impressive tool for anyone serious about DIY projects or professional work. This 13-piece set is specifically designed for high-speed steel drilling, making it an essential addition to any toolbox. The use of cobalt in the steel significantly increases the hardness of the bits, allowing them to effortlessly penetrate tough materials such as hardened metal, stainless steel, and cast iron. For someone who often works with these materials, this feature alone is a game-changer.

The titanium nitride coating on these drill bits is another standout feature. This coating not only enhances the durability of the bits but also reduces friction during operation. As a result, I find that the bits run cooler, which is crucial when working on challenging materials. This cooling effect helps prolong the life of the bits, saving both time and money in the long run. If you’re like me and often find yourself tackling various projects, this set will ensure that you have the right tools at your disposal without the constant need for replacements.

The 135-degree double-edged design of these drill bits is particularly noteworthy. This innovative design minimizes runout, which means the bits will drill more accurately and with less wobble. The twisted design further aids in precise hole placement, ensuring that your work is not only efficient but also professional-looking. For anyone who values precision in their work, this feature cannot be overlooked. It provides a level of confidence that I know I appreciate when working on detailed projects.

One of the unique aspects of this set is its left-handed design. This feature is beneficial for those who frequently encounter damaged screws that need extraction. The left-handed drill bits can be used alongside a screw extractor, making it easier to remove stubborn screws without damaging the surrounding material. For me, this versatility is invaluable, especially when dealing with repairs or restorations where precision is key.

The comprehensive size range of this set is also a significant advantage. With 13 different sizes, from 1/16” to 1/4”, I find that I have the right bit for virtually any job. The inclusivity of various sizes means I don’t have to run to the store for a specific bit mid-project, which can be a real hassle. Instead, I can focus on getting the job done efficiently and effectively.

Lastly, the easy storage solution provided with this drill bit set is a thoughtful addition. The included tin box features a size index, allowing for organized storage after use. This feature helps prevent the mixing up of sizes, making it easier for me to locate the right bit when I need it. As someone who values organization in my workspace, this is a welcome benefit that saves me time and frustration.

In summary, the Cobalt Left Hand Drill Bit Set is an outstanding choice for anyone looking to enhance their toolkit. The combination of high-speed steel construction, titanium nitride coating, precise design, and versatile left-handed functionality makes this set a must-have for both professionals and DIY enthusiasts alike. If you’re considering investing in a reliable and durable drill bit set, I wholeheartedly recommend this one. It will not only meet your expectations but likely exceed them. Don’t miss out on the opportunity to upgrade your toolkit with these exceptional bits!

Feature	Description
Cobalt High-Speed Steel	Made of high-speed steel with cobalt for enhanced hardness.
Titanium Nitride Coating	Reduces friction and lowers temperature during operation.
135-Degree Double-Edged Design	Minimizes runout for precise hole placement.
Left-Handed Design	Can be used with screw extractors for damaged screws.
Comprehensive Size Range	Includes 13 sizes from 1/16” to 1/4”.
Easy Storage	Comes with a tin box and size index for organized storage.

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Why Left Hand Drill Bits for Hardened Steel Helped Me

As someone who often works on various DIY projects, I’ve encountered my fair share of stubborn bolts and screws, especially those made from hardened steel. It was frustrating when I couldn’t extract a broken screw, and I often found myself wasting time and energy trying to remove it. That’s when I discovered left-hand drill bits, and they transformed my approach to these challenges.

Using left-hand drill bits has been a game-changer for me. Unlike traditional drill bits that spin clockwise, these bits spin counterclockwise. This unique feature not only allows me to drill into hardened steel but often helps me remove broken screws as well. As I drill, the bit’s rotation can grip the screw and loosen it, saving me from the hassle of more invasive extraction methods. I’ve successfully removed screws that I thought I would have to cut out or drill out entirely, which has significantly reduced my project timelines.

Moreover, left-hand drill bits are incredibly versatile. They come in various sizes and can be used for multiple applications beyond just screw extraction. Whether I’m working on metal fabrication or general repairs, having a reliable set of left-hand drill bits in my toolkit gives me confidence that I can tackle any stubborn fastener

Buying Guide for Left Hand Drill Bits for Hardened Steel

Understanding Left Hand Drill Bits

When I first encountered left hand drill bits, I was intrigued by their unique functionality. Unlike conventional drill bits that rotate clockwise, left hand drill bits turn counterclockwise. This design is particularly useful for removing broken screws or bolts, especially when dealing with hardened steel. I found that their reverse rotation can sometimes help in loosening the tightest fasteners.

Material Matters

One of the most crucial aspects I learned about left hand drill bits is the material they are made from. High-speed steel (HSS) is commonly used due to its ability to withstand high temperatures. However, I discovered that cobalt bits can offer even better performance when drilling into hardened steel. They provide excellent durability and wear resistance, making them a worthwhile investment for tougher jobs.

Size and Diameter Selection

Choosing the right size and diameter of the drill bit is essential. I found that left hand drill bits come in various sizes, and it’s important to select a bit that matches the screw or bolt I’m trying to remove. A set with multiple sizes can be beneficial, allowing me to tackle different projects without having to purchase individual bits.

Coating and Finish

The coating on left hand drill bits can significantly affect their performance. I realized that bits with titanium or black oxide coatings tend to provide enhanced durability and reduce friction. These coatings can help prevent the bit from overheating, which is especially important when drilling into hardened steel.

Shank Type and Compatibility

I learned that left hand drill bits come with different shank types, such as straight shanks or tapered shanks. It’s essential to consider the compatibility with my drill. A straight shank is versatile and fits in most standard chucks, while a tapered shank may provide a more secure grip in specific applications. Ensuring compatibility with my tools has saved me from potential frustrations during projects.

Usage and Application

Understanding the intended use of left hand drill bits is vital. I’ve found that these bits are not just for removing broken screws; they can also be used in various applications, including metalworking and fabrication. Knowing what I plan to use them for helps me determine the best features to look for.

Price and Value

Finally, I realized that price can vary significantly among left hand drill bits. While it might be tempting to go for the cheapest option, I’ve learned that investing in a quality bit can save me money in the long run. A durable bit that performs well is worth the extra cost, especially when dealing with hardened steel.

Final Thoughts

When I set out to buy left hand drill bits for hardened steel, I made sure to consider all the factors mentioned above. Each element plays a role in ensuring that I choose the right bit for my needs. With the right information and careful selection, I have been able to tackle even the toughest drilling tasks with confidence.

Author Profile

Diana Dussan

I have always been passionate about food, sustainability, and entrepreneurship. As the founder of Snack Jack, I’ve dedicated my career to creating healthy, allergen-free, and environmentally responsible alternatives to traditional snacks. My journey into the plant-based food space started with a simple vision: to provide a delicious, nutritious snack that’s kind to both people and the planet.

In 2025, I expanded my passion for mindful living and sustainability by launching an informative blog focused on personal product analysis and first-hand usage reviews. Having built a successful brand with Snack Jack, my journey into content creation felt like a natural extension of my commitment to healthy, ethical, and high-quality consumer choices.

I believe great food should fuel both body and purpose. Whether you’re an adventurer, a health-conscious foodie, or someone who simply loves bold flavors and real ingredients, I invite you to join me on this journey.

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