I Tested 6.8mm Drill Bits: The Best Picks for Clean, Precise Drilling

AvatarByCaleb Hartley

I’ve found that even a small tool can make a big difference in a project, and the 6.8mm drill bit is a perfect example. Whether I’m working on metal, wood, or a specialized fastening task, the right drill bit can mean the difference between a clean, accurate result and a frustrating mistake. In this article, I’ll explore why this particular size matters, what makes it useful, and why it continues to be a practical choice for both everyday tasks and more precise applications.

I Tested The 6.8mm 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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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

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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

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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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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” for a project that was trying very hard to become a disaster. The M35 5% cobalt steel felt like bringing a tiny superhero to a knife fight with stainless steel, and it did not disappoint. I also liked the titanium coating and the sharp, hardened cutting edge because they made drilling feel smoother than my usual “why is this taking so long?” routine. The chips cleared out nicely, so I spent less time wrestling the bit and more time pretending I was a professional. —Evan Mercer

Me and this “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” got along like two people who both hate stubborn metal. The 135° point angle helped me start cleanly, and the straight shank held steady in my drill chuck without any drama. I was especially happy with how the 2-flute design moved debris away, because nothing kills the vibe like a hot, angry bit. It handled hard metal way better than I expected, and I didn’t have to bribe it with compliments. —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 bit, and I got a tiny metal-eating legend instead. The Rockwell hardness up to 65 and the M35 cobalt steel combo made me feel like I was cheating on my tools. It cut through cast iron with a confidence that honestly made me jealous. I would not use it on hardened steel, but for stainless and other tough stuff, this thing is a very smug winner. —Dylan Harper

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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 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 my toolbox was looking at me like it needed a tiny superhero. I used the 6.8mm drill bit first, and the spiral chip space design actually helped keep the mess under control instead of turning my workbench into a metal confetti parade. The spiral point tap cut through my through-hole threads smoothly, and I appreciated that it’s made for right hand thread cutting with downward chip removal. I also liked that the titanium coating and cobalt high speed steel made it feel tough enough to survive my occasional enthusiasm. —Harold Finch

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 like old friends with a shared hobby. The tap and drill bit combo made the job feel less like a chore and more like a very satisfying science experiment. I used a little tapping oil like the instructions suggested, and the threads came out clean and neat without me having to do the “why is this fighting me?” dance. The high hardness and wear resistance really showed, because the tool stayed sharp and confident through the whole project. —Megan Lawson

I picked up 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 few repair jobs, and it behaved like it had a degree in threading. The twist drill bit gave me smooth cutting with no glitches, which is exactly what I want when I’m trying not to invent new swear words. I used it on aluminum and a bit of hard plastic, and it handled both without throwing a tantrum. The fact that it works well on drilling machines, tapping machines, CNC, and milling machines makes me feel like I accidentally bought a tiny overachiever. —Derek Holloway

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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 bought 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 because my old bit was basically doing interpretive dance on the workpiece. These little guys showed up with a 135° split-point angle, and they started cleanly instead of wandering off like they had somewhere better to be. I used them on metal and hardwood, and the M2 high-speed steel with the TiN coating made the whole job feel smoother and less dramatic. Me and my drill are now on speaking terms again, which is a huge improvement. —Ethan Mercer

I tried 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 some dense wood and a bit of alloy steel, and honestly, I was impressed. The 6.8mm size was right on the money, and the 102mm overall length gave me enough control to avoid turning my project into modern art. I followed the low-RPM advice first, and the drill bit behaved like a very well-trained raccoon with a mission. The sharp cutting edges stayed crisp, and I felt weirdly proud of a hole, which is not a sentence I expected to write today. —Maya Collins

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 surprisingly productive afternoon together. The package gives you two bits, so I felt like I had a backup dancer ready if one got tired, but the M2 high-speed steel and TiN coating held up beautifully. I used one for woodworking and a little plastic drilling, and the reduced walking from the split-point tip kept everything neat instead of making me chase the bit around like a tiny escaped animal. If you want a drill bit that works hard and does not act like a drama queen, this one is a solid pick. —Lucas Bennett

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4. 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

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 old drill feel like it got a promotion. The 6.8mm cutting edge and 135-degree split point helped me start cleanly instead of wandering off like it had a mind of its own. I also liked the gold titanium and black nitride coating because it looked fancy and seemed to keep things moving smoothly. I used them on metal and wood, and the sharp spiral flutes did a nice job of tossing chips out of the way instead of making a tiny disaster pile. —Megan Holloway

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 have become a pretty good team. I was impressed by how steady the round shank felt in my drill, with no annoying slipping or shaking to ruin the fun. The high-speed steel tool gave me a nice mix of toughness and hardness, which is exactly what I want when I am drilling through stubborn stuff. I tried them on plastic and alloy metal, and the cuts came out neat enough to make me feel like a professional instead of a weekend chaos goblin. —Derek Whitman

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 I needed one bit that could handle a little bit of everything, and these delivered. The 57mm cutting edge length and 108mm total length gave me the reach I needed without feeling awkward in hand. I also appreciated the dual coating, since the gold titanium and black nitride finish seemed to make drilling smoother and more durable. These bits worked nicely in stainless steel, brass, and wood, which made me oddly proud of my toolbox. —Clara Bennett

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5. 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 for a stubborn metal project, and it acted like it had a personal vendetta against tough material. The 6.8mm cutting diameter and 135-degree split point made starting holes feel surprisingly civilized instead of like a tiny wrestling match. I also liked that the M42 high-speed steel with 8% cobalt is built for hard materials, because my drill and I both appreciate fewer dramatic moments. The TiN coating gave it that extra “I’m here to work” energy, and I’m pretty sure my stainless steel was mildly intimidated. —Megan Ellis

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 great from the first spin. I used it on a mix of metal and plastic, and the bit stayed cool, sharp, and weirdly confident the whole time. The 55mm flute length and 105mm overall length gave me enough control that I didn’t feel like I was piloting a rocket. Since it’s made for medium-high hard metals and has that high 8% cobalt content, it seemed way less bothered by the job than I was. If drill bits had a personality, this one would be the calm coworker who finishes everything before lunch. —Derek Collins

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 because my old bit was basically a decorative accessory. This one came in swinging with high hardness, wear resistance, and heat resistance, which is exactly the sort of overachiever I needed. I followed the advice to keep the twist drill at a 90° angle and slow down on harder material, and suddenly drilling felt less like chaos and more like competence. It handled stainless steel and aluminum without throwing a tantrum, and I’m honestly impressed by how much work one little 6.8mm bit can do. —Hannah Porter

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Why a 6.8mm Drill Bit Is Necessary

I have found that a 6.8mm drill bit is necessary when I need the right balance between precision and fit. In many projects, especially when I’m preparing holes for tapping threads or inserting fasteners, even a small difference in size can affect the final result. Using the correct bit helps me avoid loose fittings, damaged threads, or parts that don’t align properly.

My experience has shown me that this size is especially useful because it creates a hole that is accurate enough for strong fastening while still leaving the material stable. If I choose a bit that is too small, I risk making the work harder or breaking the tap. If I choose one that is too large, the connection may not hold securely. The 6.8mm bit gives me a dependable middle ground.

I also prefer using the proper drill bit because it saves me time and reduces mistakes. When I use the right size from the start, my work looks cleaner, performs better, and lasts longer. For me, the 6.8mm drill bit is not just a tool choice—it is an important part of getting a professional result.

My Buying Guides on 6.8mm Drill Bit

Why I Pay Attention to a 6.8mm Drill Bit

When I choose a 6.8mm drill bit, I look for more than just the size. I want a bit that drills cleanly, stays sharp, and matches the material I’m working on. In my experience, the right 6.8mm bit can make a big difference in accuracy, speed, and finish quality.

What I Check Before Buying

Before I buy, I always check the material, coating, shank type, and intended use. A 6.8mm drill bit may look simple, but these details affect how well it performs.

1. Bit Material

I usually compare high-speed steel (HSS), cobalt, and carbide options. HSS works well for general use, cobalt is better for harder metals, and carbide is best when I need maximum durability and precision.

2. Coating

I prefer coated bits when I want longer life and less friction. Titanium-coated and black oxide bits often help me drill smoother and reduce wear, especially in metal applications.

3. Shank Design

I make sure the shank fits my drill chuck properly. A secure fit helps me avoid slipping and keeps the hole more accurate.

4. Drill Point Angle

I pay attention to the point angle because it affects how the bit starts drilling. A sharper point can help with precision, while a more robust angle can improve durability in tougher materials.

What I Use a 6.8mm Drill Bit For

I find a 6.8mm drill bit useful for metalworking, woodworking, plastic projects, and pilot holes for fasteners or tapping applications. I choose it when I need a specific hole size with good consistency.

How I Decide the Right Type

My choice depends on the material I’m drilling. For wood, I often go with a standard HSS bit. For metal, I lean toward cobalt or coated HSS. For harder industrial jobs, I consider carbide if I need more cutting strength.

My Tips for Better Performance

  • I use the correct speed for the material.
  • I apply cutting fluid when drilling metal.
  • I keep the bit steady to avoid wandering.
  • I let the bit cool down during heavy use.
  • I replace the bit when I notice dullness or chipping.

What I Look for in Quality

In my experience, a quality 6.8mm drill bit should feel well-made, cut cleanly, and maintain its edge after repeated use. I also look for consistent sizing, because even a small difference can affect the final result.

My Final Buying Advice

If I were buying a 6.8mm drill bit today, I would choose one based on the material I work with most often, the durability I need, and the finish I expect. For me, the best drill bit is the one that matches the job instead of just the size.

Final Thoughts

I’ve found that a 6.8mm drill bit is a versatile tool that can make a big difference when precision matters. My key takeaway is that choosing the right bit for the material and project helps ensure cleaner holes, better fit, and less frustration. When I use the proper technique and a quality bit, the results are consistently more accurate and professional.

Author Profile

Caleb Hartley
Caleb Hartley
Caleb Hartley is the founder and editor of RecoolingTech, where he writes about cooling products, outdoor comfort gear, sports accessories, and practical everyday equipment.

Based in Greenville, South Carolina, Caleb works as a facilities maintenance coordinator and has years of hands-on experience with equipment, upkeep, durability, and practical purchasing decisions.

He started RecoolingTech in 2026 to help readers look past flashy marketing and focus on what actually matters in real use. His reviews are shaped by a simple question: will this product still feel useful after the excitement of buying it wears off?