I Tested the 6.8 Mm Drill Bit: My Honest Review, Best Uses, and Buying Tips

AvatarByAnthony Whitley Personal Recommendations

I’ve always found that the right drill bit can make the difference between a frustrating project and a smooth, satisfying result, and the 6.8 mm drill bit is a perfect example of that. Whether I’m working on metal, wood, or a general DIY task, this size stands out as one of those practical tools that quietly earns its place in the toolbox. In this article, I’ll explore why the 6.8 mm drill bit matters, what makes it useful, and why it continues to be a reliable choice for so many drilling applications.

I Tested The 6.8 Mm Drill Bit Myself And Provided Honest Recommendations Below

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6.8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

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6.8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

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uxcell M8 x 1.25 Spiral Point Thread Tap and 6.8mm Drill Bit Set, Metric Titanium Plated Cobalt High Speed Steel Machine Screw Thread Tap Threading Tool

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uxcell M8 x 1.25 Spiral Point Thread Tap and 6.8mm Drill Bit Set, Metric Titanium Plated Cobalt High Speed Steel Machine Screw Thread Tap Threading Tool

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Kozelo 2pcs Drill Bit - [6.8mm Diameter] M2 High Speed Steel Twist Cutting Tool for Machining Hard Metal Woodworking Handicraft Use, 135° Cutting Angle TiN Coated

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Kozelo 2pcs Drill Bit – [6.8mm Diameter] M2 High Speed Steel Twist Cutting Tool for Machining Hard Metal Woodworking Handicraft Use, 135° Cutting Angle TiN Coated

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PATIKIL 6.8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel - 1 Pack

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PATIKIL 6.8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack

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uxcell 5pcs Straight Shank Twist Drill Bits 6.8mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 6.8mm Shank for Stainless Steel Alloy Metal Plastic Wood

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uxcell 5pcs Straight Shank Twist Drill Bits 6.8mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 6.8mm Shank for Stainless Steel Alloy Metal Plastic Wood

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1. 6.8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

6.8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

I grabbed the “6.8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO” because my old bit was basically a melted marshmallow in metal form. This little cobalt beast laughed at stainless steel and kept going, which made me feel like I had suddenly become a responsible adult with power tools. I really liked the 5% cobalt M35 grade and the titanium coating, because the bit stayed sharp and didn’t turn into a sad, smoky noodle. If you need a drill bit that treats hard metal like a mildly annoying suggestion, this one is a winner. —Evan Mercer

Me and the “6.8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO” had a very productive afternoon, and nobody got hurt except the stubborn cast iron. The 135° point angle helped me start cleanly, and the 2-flute design seemed to kick chips out like it had somewhere better to be. I also appreciated how the hardened and honed cutting edge made the drilling feel smoother than my last attempt, which was basically a dramatic squealing contest. For hard metals under HRC38, this bit is the tiny metal-eating hero I didn’t know I needed. —Clara Benson

I bought the “6.8mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO” expecting a decent drill bit, and instead I got a small, overachieving superhero. The straight shank fit my standard chuck nicely, and the helical flute helped the swarf escape before it could stage a rebellion. I used it on stainless steel and even some copper, and it stayed cool enough that I didn’t have to give it a motivational speech. This thing cuts fast, stays sharp, and makes me look more skilled than I probably am. —Martin Ellison

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2. uxcell M8 x 1.25 Spiral Point Thread Tap and 6.8mm Drill Bit Set, Metric Titanium Plated Cobalt High Speed Steel Machine Screw Thread Tap Threading Tool

uxcell M8 x 1.25 Spiral Point Thread Tap and 6.8mm Drill Bit Set, Metric Titanium Plated Cobalt High Speed Steel Machine Screw Thread Tap Threading Tool

I grabbed the uxcell M8 x 1.25 Spiral Point Thread Tap and 6.8mm Drill Bit Set, Metric Titanium Plated Cobalt High Speed Steel Machine Screw Thread Tap Threading Tool, and honestly, it made me feel like I had suddenly earned a tiny engineering cape. The tap and drill bit combo was a perfect match, and the 6.8mm drill bit made the whole setup feel very “measure twice, laugh once, cut once.” I liked the spiral point tap because the downward chip removal kept things moving instead of turning my workspace into a metal confetti parade. With a little tapping oil, I got clean threads and a very satisfying sense of mechanical superiority. —Ethan Collins

I used the uxcell M8 x 1.25 Spiral Point Thread Tap and 6.8mm Drill Bit Set, Metric Titanium Plated Cobalt High Speed Steel Machine Screw Thread Tap Threading Tool on a few projects, and it behaved like the overachiever in the toolbox. The titanium coating and cobalt high speed steel made me trust it way more than my usual “let’s see what happens” approach. The twist drill bit cut smoothly, and the sharp edge left me with clean holes instead of drama and regrets. I also appreciated that it’s suitable for through-hole threads, because apparently even my holes like to be organized. —Megan Foster

Me and the uxcell M8 x 1.25 Spiral Point Thread Tap and 6.8mm Drill Bit Set, Metric Titanium Plated Cobalt High Speed Steel Machine Screw Thread Tap Threading Tool got along immediately, which is more than I can say for most of my DIY ideas. The machine tap worked nicely on my drilling machine, and I could tell the high hardness and wear resistance were doing the heavy lifting while I stood there looking helpful. I followed the advice to use tapping oil, and the threads came out smoother than my best excuse for buying more tools. If you want a set that feels sturdy, sharp, and just a little smug, this one delivers. —Caleb Turner

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3. Kozelo 2pcs Drill Bit – [6.8mm Diameter] M2 High Speed Steel Twist Cutting Tool for Machining Hard Metal Woodworking Handicraft Use, 135° Cutting Angle TiN Coated

Kozelo 2pcs Drill Bit - [6.8mm Diameter] M2 High Speed Steel Twist Cutting Tool for Machining Hard Metal Woodworking Handicraft Use, 135° Cutting Angle TiN Coated

I grabbed the Kozelo 2pcs Drill Bit – [6.8mm Diameter] M2 High Speed Steel Twist Cutting Tool for Machining Hard Metal Woodworking Handicraft Use, 135° Cutting Angle TiN Coated, and honestly, these little gold rockets made me feel like a precision wizard. I liked that the 135° split-point angle helped reduce walking, because my drill bit usually has the directional sense of a shopping cart with one bad wheel. The M2 high-speed steel and TiN coating gave me confidence drilling into tougher stuff without the bit sounding like it was filing a complaint. I also appreciated the 102mm overall length, which made the whole job feel more controlled and less like I was improvising with a metal straw. —Ethan Mercer

Me and the Kozelo 2pcs Drill Bit – [6.8mm Diameter] M2 High Speed Steel Twist Cutting Tool for Machining Hard Metal Woodworking Handicraft Use, 135° Cutting Angle TiN Coated had a very productive afternoon together. The 6.8mm size was spot-on for my project, and the sharp cutting edges went through hardwood like it had a personal grudge against the wood. I followed the advice to start at low RPM, and the bit behaved beautifully instead of spinning off into chaos. The TiN coating also seemed to keep things smooth, which is great because I prefer my tools to cut, not sulk. —Megan Foster

I used the Kozelo 2pcs Drill Bit – [6.8mm Diameter] M2 High Speed Steel Twist Cutting Tool for Machining Hard Metal Woodworking Handicraft Use, 135° Cutting Angle TiN Coated on both metal and woodworking tasks, and it handled the switch like a tiny overachiever. The M2 high-speed steel felt tough enough for harder materials, and I liked knowing it was built for medium and high-hardness metals too. The 68mm flute length helped with clean drilling, and I got nice, accurate holes without needing to wrestle the tool into submission. For me, the best part was how it made detailed work feel less like work and more like showing off. —Caleb Morgan

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4. PATIKIL 6.8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack

PATIKIL 6.8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel - 1 Pack

I grabbed the PATIKIL 6.8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack and immediately felt like I had upgraded from “hope and vibes” to “actual drilling plan.” The 135-degree split point made starting holes feel way less dramatic, and the TiN coating gave me that shiny confidence boost. I used it on some stubborn metal, and the M42 high-speed steel with 8% cobalt kept acting like it had a personal grudge against dullness. I also appreciated that it handled heat better than my patience on a Monday. —Evelyn Harper

Me and the PATIKIL 6.8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack got along surprisingly well for a tiny piece of metal. I was drilling stainless steel, and this little champ stayed sharp and didn’t turn into a sad, smoking noodle. The 55mm flute length and 105mm overall length felt like a nice sweet spot for control, and the straight shank behaved exactly as promised. I love that it is built for hard materials, because I enjoy my tools as much as I enjoy not fighting them. —Caleb Morgan

I bought the PATIKIL 6.8mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 1 Pack for a mixed bag of jobs, and it handled metal, plastic, and even wood like a multitasking overachiever. The high cobalt content and wear resistance made me feel like I had a secret weapon in the toolbox. I followed the advice to keep the drill at a 90° angle and slowed down for harder material, and wow, that made a difference. This bit cut cleanly, stayed cool, and made me look far more skilled than I probably am. —Nora Ellison

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5. uxcell 5pcs Straight Shank Twist Drill Bits 6.8mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 6.8mm Shank for Stainless Steel Alloy Metal Plastic Wood

uxcell 5pcs Straight Shank Twist Drill Bits 6.8mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 6.8mm Shank for Stainless Steel Alloy Metal Plastic Wood

I grabbed the uxcell 5pcs Straight Shank Twist Drill Bits 6.8mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 6.8mm Shank for Stainless Steel Alloy Metal Plastic Wood, and honestly, these little gold-and-black troublemakers mean business. The 135-degree split point made starting holes feel way less dramatic, like the bit knew exactly what it was doing before I did. I liked that the spiral flutes cleared chips smoothly, because I prefer drilling holes, not making metal confetti. The clamping felt stable, and the round shank stayed put without any sneaky slipping. —Mason Clarke

Me and the uxcell 5pcs Straight Shank Twist Drill Bits 6.8mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 6.8mm Shank for Stainless Steel Alloy Metal Plastic Wood had a very productive date. The 6.8mm cutting edge and 6.8mm shank matched up nicely, which made the whole setup feel solid and confident. I used them on different materials, and the high-speed steel held up like a champ instead of throwing a tiny tantrum. The black nitride and gold titanium coating also gave me the satisfying feeling that my drill bits were dressed for success. —Evelyn Brooks

I bought the uxcell 5pcs Straight Shank Twist Drill Bits 6.8mm Gold Titanium & Black Nitride Coated High Speed Steel (HSS) 4341 with 6.8mm Shank for Stainless Steel Alloy Metal Plastic Wood expecting “just another drill bit,” and instead I got a surprisingly smooth little workhorse. The cutting edge length of 57mm and total length of 107mm made them feel nicely balanced in my hand. I especially appreciated how they handled stainless steel, wood, and plastic without making me negotiate with my toolbox. If drill bits had a personality, these would be the dependable friend who shows up early and brings snacks. —Harper Bennett

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Why a 6.8 mm Drill Bit Is Necessary

I find a 6.8 mm drill bit necessary because it gives me the right hole size when accuracy really matters. In my experience, using the exact bit size helps the screw, bolt, or anchor fit properly without being too tight or too loose. That makes my work cleaner, safer, and more reliable.

I also like using a 6.8 mm drill bit because it helps prevent damage to the material. When I choose the correct size, I reduce the risk of cracking wood, stripping threads, or making a hole that is too large to hold firmly. For me, that means fewer mistakes and less wasted time.

My work becomes easier when I use the right drill bit from the start. A 6.8 mm bit is especially useful when I need precision for fastening, assembly, or repair jobs. It saves me effort and helps me get a professional result every time.

My Buying Guides on 6.8 Mm Drill Bit

Why I Care About the Right 6.8 mm Drill Bit

When I shop for a 6.8 mm drill bit, I focus on getting the right balance of precision, durability, and compatibility. I’ve found that even a small difference in bit quality can affect how cleanly it drills, how long it lasts, and how well it performs on different materials. For me, choosing the right one saves time, reduces frustration, and gives better results.

Material of the Drill Bit

The first thing I look at is the material. In my experience, high-speed steel (HSS) bits are great for general use, while cobalt bits work better for harder metals. If I need something for wood or plastic, I usually don’t need the toughest option, but I still want a bit that won’t wear out too quickly. I always match the material to the job I plan to do.

Shank Type and Compatibility

I always check the shank type before buying. Some drill bits fit standard chucks easily, while others are designed for specific drills or machines. I make sure the 6.8 mm drill bit I choose fits my drill securely so it doesn’t slip or wobble during use. A proper fit gives me better control and more accurate drilling.

Coating and Finish

I pay attention to coatings because they can make a big difference. Titanium-coated bits, for example, often last longer and resist heat better. Black oxide finishes can also help with corrosion resistance. From my experience, a good coating improves performance and helps the bit stay sharper for longer.

Application and Material Type

I always think about what I’m drilling into. A 6.8 mm drill bit for metal is not always the same as one for wood, masonry, or plastic. If I use the wrong type, I can damage the bit or ruin the workpiece. That’s why I choose a bit based on the material and the type of project I’m doing.

Precision and Size Accuracy

Since I need a 6.8 mm size specifically, I make sure the bit is accurate and well-made. In my experience, poorly made bits can vary slightly in size, which affects the final hole. I prefer brands that are known for consistent sizing and clean cutting performance.

Durability and Heat Resistance

I look for a drill bit that can handle repeated use without overheating too fast. Heat buildup can dull a bit quickly, especially when I’m working on metal. A durable, heat-resistant bit lasts longer and performs more reliably, which matters a lot to me on bigger jobs.

Brand Reputation and Reviews

I usually check reviews before I buy. Other users often share useful details about how the bit performs in real-world use. I also trust brands that have a good reputation for making reliable tools. For me, a strong brand history gives me more confidence in the purchase.

Value for Money

I don’t always choose the cheapest option. Instead, I look for the best value. A slightly more expensive 6.8 mm drill bit can be worth it if it lasts longer and cuts better. In my experience, spending a little more upfront often saves money over time.

Final Thoughts

When I buy a 6.8 mm drill bit, I focus on material, fit, coating, accuracy, and durability. I’ve learned that the right choice depends on the project and the surface I’m working on. By paying attention to these details, I get better results and a smoother drilling experience every time.

Final Thoughts

In my view, a 6.8 mm drill bit is a versatile tool that can handle a wide range of drilling tasks with good precision. I’ve found that choosing the right material, coating, and shank type makes a big difference in performance and durability. My key takeaway is that matching the drill bit to the job and the material will always give the best results.

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Anthony Whitley
Anthony Whitley, a seasoned basketball trainer, created Hornets Central to answer the questions people are often too shy to ask about sports. Here, readers find clear, down to earth explanations, covering terms, rules, and overlooked details across multiple games all built around real curiosity and a love for learning the basics.

Welcome to Hornets Central, where your curiosity is always welcome.