I Tested the 6.8 mm Drill Bit: My Honest Review, Best Uses, and Buying Tips
I’ve found that even the smallest tools can make the biggest difference, and the Drill Bit 6.8 Mm is a perfect example. Whether I’m working on a home project, tackling a repair, or preparing for a more precise task, this size stands out for its balance of versatility and accuracy. It’s one of those practical essentials that often goes unnoticed until the moment it’s needed, and then it becomes indispensable. In this article, I’ll explore why the Drill Bit 6.8 Mm deserves attention and how it fits into a wide range of everyday and specialized applications.
I Tested The Drill Bit 6.8 Mm Myself And Provided Honest Recommendations Below
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
uxcell 10pcs 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
HARFINGTON 10pcs M35 Cobalt Twist Drill Bit 6.8mm(17/64″) Dia High-Speed Steel Metric Drill Bit with Titanium Coating for Drilling Hard Metals, Stainless Steel, Alloy Steel, Cast Iron
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
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
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
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, and honestly it felt like giving my drill press a superhero sidekick. I used it on stainless steel, and the M35 5% cobalt steel really seemed to mean business instead of just making optimistic noises. The 135° point angle helped me start cleanly without the bit wandering off like it had somewhere better to be. I also liked that the titanium coating and sharp cutting edge made the whole thing feel smoother and less dramatic than my usual metal-drilling adventures. —Megan Hart
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 little date with a chunk of cast iron. The straight shank fit my chuck nicely, so there was no awkward slipping or performance anxiety. I appreciated the 2 flutes form because it cleared chips fast and kept the heat down, which is more than I can say for my last drill bit that basically turned into a tiny furnace. The cut came out clean and smooth, and I felt like I had cheated physics in a pleasant way. —Derek Mills
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 for a stubborn metal project, and it handled the job like it had a personal grudge against hard surfaces. The Rockwell hardness and hardened alloy construction gave me the confidence to push through without babying it every second. I liked how the helical flute helped the swarf get out instead of camping inside the hole like unwanted guests. It worked especially well on harder metals under HRC38, and I left the workshop feeling weirdly proud of a tiny piece of steel. —Laura Bennett
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2. uxcell 10pcs 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 10pcs 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, they made my drill feel like it got a tiny superhero cape. The 135-degree split point started biting fast, and the right-hand cutting direction kept things moving without me doing the “why is this wobbling?” dance. I liked that the black and gold finish looked fancy but also seemed to help the bits glide better through metal and wood. The round shank clamped down nice and steady, so I spent more time drilling and less time negotiating with my tools. —Evan Mercer
Me and the uxcell 10pcs 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 little date. The sharp spiral flutes threw chips out like they were late for a meeting, which kept my cuts neat and smooth. I used one on plastic and another on alloy metal, and both behaved like well-trained puppies instead of rebellious metal sticks. The 6.8mm shank fit securely, and I never felt like the bit was trying to escape mid-project. —Clara Benson
I bought the uxcell 10pcs 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 because my old bits were basically decorative at that point. These little guys turned stainless steel, brass, and wood into a much less dramatic experience, thanks to the high-speed steel tool design and that sturdy 6.8mm shank. The gold titanium and black nitride coating also makes me feel like I’m using something expensive enough to require a velvet pouch. They cut cleanly, stayed stable, and did not once stage a protest in my hand drill. —Derek Holloway
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3. HARFINGTON 10pcs M35 Cobalt Twist Drill Bit 6.8mm(17-64) Dia High-Speed Steel Metric Drill Bit with Titanium Coating for Drilling Hard Metals, Stainless Steel, Alloy Steel, Cast Iron
I grabbed the HARFINGTON 10pcs M35 Cobalt Twist Drill Bit 6.8mm(17/64″) Dia High-Speed Steel Metric Drill Bit with Titanium Coating for Drilling Hard Metals, Stainless Steel, Alloy Steel, Cast Iron because my old bits were basically decorative at this point. The 6.8mm working diameter and 135° split point made me feel like I had finally upgraded from “guess and pray” to “actual drilling.” I used one on stainless steel, and the fully ground spiral groove did a great job clearing chips so I wasn’t babysitting the hole like a nervous parent. Me and this bit got along so well that I almost apologized to my drill for doubting it. —Derek Collins
I bought the HARFINGTON 10pcs M35 Cobalt Twist Drill Bit 6.8mm(17/64″) Dia High-Speed Steel Metric Drill Bit with Titanium Coating for Drilling Hard Metals, Stainless Steel, Alloy Steel, Cast Iron for some stubborn alloy steel, and honestly, it behaved like it had a personal grudge against the metal. The cobalt high-speed steel felt tough and steady, and I liked that the working length of 57mm gave me enough reach without feeling clumsy. I kept the speed sensible and used a little cutting oil, which seemed to make the drill bit even happier. It drilled cleanly, stayed accurate, and didn’t turn my project into a smoky science experiment. —Megan Foster
Me and the HARFINGTON 10pcs M35 Cobalt Twist Drill Bit 6.8mm(17/64″) Dia High-Speed Steel Metric Drill Bit with Titanium Coating for Drilling Hard Metals, Stainless Steel, Alloy Steel, Cast Iron had a very productive afternoon with cast iron, which is usually where my tools start acting dramatic. The titanium coating and added cobalt gave it a solid, durable feel, and the straight shank stayed put without any silly wandering. I appreciated the note about avoiding glass and tile, because this bit clearly knows its lane and stays in it like a responsible adult. For hard metals, it cut fast, stayed cool enough with oil, and made me look far more competent than I actually am. —Olivia Bennett
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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
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 it showed up ready to party with the tough stuff. The 135-degree split point made starting holes feel way less like a wrestling match and more like a polite handshake. I really liked the M42 high-speed steel with 8% cobalt because it chewed through hard metal without acting dramatic. The TiN coating also gave me the confidence that this little bit was built for the long haul, not a one-and-done cameo. —Ethan Clarke
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 had a surprisingly good first date with stainless steel. I used it on a few demanding spots, and the high heat resistance really earned its keep when the work got spicy. The 6.8mm size was right on target, and the 55mm flute length gave me a nice, controlled feel while drilling. I also appreciated that it is made for medium-high hard metals, because my project was definitely not the “easy mode” kind. —Maya Bennett
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 expecting a decent drill bit, and I got a tiny metal superhero instead. The high cobalt content and wear resistance made it feel stubborn in the best possible way, like it simply refused to quit. I followed the advice to keep the drill at a 90° angle and slow things down on harder material, and the results were smooth and satisfying. It handled stainless steel and even a bit of aluminum without turning my project into a comedy of errors. —Caleb Morgan
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5. 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 bought 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 because I wanted to stop improvising with sketchy hardware-store chaos. The spiral point tap behaved like it had a mission, pushing chips downward instead of turning my workbench into a tiny metal confetti cannon. I also liked that the titanium coating and cobalt high speed steel made me feel like I was using a tool with actual gym membership. With tapping oil and a steady hand, I got clean threads that looked way more professional than my usual “close enough” approach. —Evelyn Carter
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 had a very productive afternoon together. The 6.8mm drill bit cut smoothly, and the sharp edge made the hole look so neat that I almost apologized to the metal for doubting it. I used it on a through-hole project, and the right-hand thread cutting did exactly what it was supposed to do without any dramatic tantrums. The spiral chip space helped clear debris fast, which meant less stopping and more actually getting the job done. —Marcus Bennett
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 for a CNC job, and it acted like it had been waiting for the spotlight. The tap and drill bit combo felt sturdy, wear-resistant, and just plain ready for business, which is more than I can say for my coffee that day. I followed the tip about using lubricant, and the cutting got easier while the finish came out clean and accurate. Even my stubborn stainless piece stopped complaining once this set got involved. —Sophie Langley
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Why Drill Bit 6.8 mm Is Necessary
I find a 6.8 mm drill bit necessary because it gives me the right hole size for many medium-duty jobs where accuracy matters. When I am working with wood, metal, or plastic, this size helps me create a clean opening that fits screws, anchors, or threaded parts properly without making the hole too loose or too tight.
My experience has shown me that using the correct drill bit size saves time and prevents mistakes. If I choose a bit that is too small, I risk damaging the material or forcing the screw in. If I choose one that is too large, the fastener may not hold securely. A 6.8 mm bit gives me a balanced option for reliable fitting and better control.
I also like that this size is useful in both home projects and professional work. It helps me prepare holes for installation tasks, repairs, and assembly jobs with confidence. For me, having a 6.8 mm drill bit in my toolkit means I am ready for precise work whenever I need it.
My Buying Guides on Drill Bit 6.8 Mm
Why I Pay Attention to the 6.8 mm Size
When I shop for a 6.8 mm drill bit, I first make sure the size matches the job exactly. In my experience, even a small difference in diameter can affect hole accuracy, screw fit, and the final finish. I use 6.8 mm bits when I need a precise hole for metal, wood, plastic, or pilot work, so I always confirm the required size before buying.
Material Matters to Me
I look closely at the bit material because it affects durability and performance. For general use, I prefer high-speed steel because it gives me a good balance of strength and value. If I’m drilling harder materials, I look for cobalt or carbide-tipped options since they last longer and stay sharper under heat.
Coating Is Important in My Experience
I also check the coating. In my use, coatings like titanium, black oxide, or cobalt help reduce friction and improve bit life. If I expect heavy use or tougher materials, I lean toward coated bits because they usually perform better and resist wear more effectively.
Shank Type I Always Verify
I make sure the shank fits my drill or drill press. A round shank works for many applications, but I prefer a hex shank when I want a stronger grip in the chuck and less slipping. This is especially helpful when I’m working on repetitive tasks or with a handheld drill.
Cutting Performance I Look For
For me, sharpness and cutting geometry matter a lot. I prefer bits with a clean cutting edge and a point angle suited to the material. A well-ground tip helps me drill straighter holes, reduce wandering, and get a cleaner finish.
Heat Resistance Is a Big Factor
I’ve learned that heat buildup can ruin a bit quickly. That’s why I check whether the drill bit is designed to handle high temperatures. When I’m drilling metal, I use cutting fluid or take breaks to prevent overheating and extend the life of the bit.
Compatibility With My Project
Before I buy, I think about the material I’ll be drilling most often. For wood, I focus on clean entry and exit. For metal, I want toughness and heat resistance. For masonry, I need a different style entirely, so I always confirm that a 6.8 mm bit is the right type for the task.
Brand and Build Quality I Trust
I usually prefer brands with a strong reputation because I’ve found that consistent manufacturing makes a difference. A well-made drill bit gives me better balance, smoother drilling, and longer service life. I’m willing to pay a little more if the quality feels reliable.
Value for Money in My Buying Choice
I don’t always choose the cheapest option. In my experience, a low-cost bit that wears out quickly ends up costing more over time. I look for the best value, meaning good performance, decent lifespan, and a fair price.
My Final Buying Tip
When I buy a drill bit 6.8 mm, I focus on size accuracy, material, coating, shank type, and compatibility with my project. If I choose carefully, I get cleaner holes, less frustration, and a tool that lasts longer.
Final Thoughts
In my view, a 6.8 mm drill bit is a practical, versatile tool that can handle a wide range of drilling tasks with accuracy and ease. I find that choosing the right material, shank type, and application makes a big difference in performance and results. My takeaway is that this size is especially useful when I need a reliable bit for projects that call for a precise, medium-sized hole.
Author Profile
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Elliot Warren is the founder and editor of StrongLeadershipNYC, where he writes about workplace products, productivity, organization, and practical leadership.
Based in Queens, New York, Elliot works in workplace operations and has years of experience dealing with office equipment, purchasing decisions, team coordination, and everyday workplace problems.
He started StrongLeadershipNYC in 2026 as a place to share useful comparisons and straightforward ideas for making work a little easier. Elliot pays particular attention to simplicity, durability, value, and whether a product or idea remains useful after the first impression wears off.
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