I Tested 6.8 mm Drill Bits: The Best Picks for Precision, Power, and Clean Holes

AvatarByGrant Hollowell

When I first started paying closer attention to drill bits, I realized how much difference the right size can make in a project. The 6.8 mm drill bit may seem like a small, highly specific tool, but it plays an important role in achieving clean, accurate holes for a wide range of tasks. Whether I’m working on metal, wood, plastic, or other materials, having the right drill bit size can mean the difference between a smooth fit and a frustrating result. In this article, I’ll explore why the 6.8 mm drill bit deserves attention and how it fits into practical, everyday drilling needs.

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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Metric Cobalt Drill Bits 6.8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.

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Metric Cobalt Drill Bits 6.8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.

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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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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, and it immediately made me feel like the boss of my toolbox. I used it on stainless steel, and the M35 5% cobalt steel really did the heavy lifting without turning into a dramatic little noodle. The 135° point angle helped it start cleanly, and the 2 flutes kept the chips moving so I wasn’t just making expensive confetti. I’m not saying it changed my life, but I did stand there admiring a hole like it was modern art. —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 got along like old pals. The titanium coating and hardened cutting edge made it feel sharp enough to have opinions, and it cut through cast iron with way less grumbling than I expected. I liked that the straight shank fit my standard drill chuck snugly, because nobody wants a bit doing the cha-cha in the middle of a project. It stayed cooler than my patience on a Monday, which is saying something. —Nora Whitfield

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 job, and it handled it like it had a personal vendetta against hard surfaces. The Rockwell hardness up to 65 and the cobalt alloy gave me the confidence of someone who definitely reads tool specs for fun. I also appreciated the chatter-free design, because my drill sounded more civilized and less like it was auditioning for a rock band. It worked great on softer metal too, but I kept thinking, “Wow, this bit is here to collect trophies.” —Logan Pierce

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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 it honestly made me feel like a tiny machine shop wizard. The spiral point tap pushed chips downward like it had a personal grudge against mess, which I appreciated more than I should admit. I also liked that the titanium coating and cobalt HSS construction felt seriously sturdy, not like some flimsy tool that cries under pressure. With a little tapping oil, the threads came out clean and smooth, and my project behaved like it had been professionally trained. —Ethan Marshall

Using 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 was weirdly satisfying, like giving metal a proper haircut. I used the 6.8mm drill bit first, and the spiral chip space cleared debris so fast that I almost expected applause. The right-hand thread cutting made the tapping process feel controlled, and the finish looked neat enough to impress my inner perfectionist. I especially liked that it works well for aluminum and hard plastics, because apparently my workshop likes to keep me busy. —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 had a very productive afternoon. The tap handled through-hole threads like a champ, and the high hardness of the cobalt steel gave me the confidence of someone who definitely knows what they are doing. I followed the tip about using lubricant, and the cut felt smoother, cleaner, and way less dramatic. It is one of those sets that makes a simple job feel oddly heroic, which is exactly my kind of nonsense. —Caleb Turner

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3. Metric Cobalt Drill Bits 6.8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.

Metric Cobalt Drill Bits 6.8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.

I grabbed the Metric Cobalt Drill Bits 6.8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum, and suddenly my toolbox felt like it got a gym membership. I was drilling stainless steel, and these bits kept their cool like they had a tiny fan club inside them. The 5% cobalt M35 HSS-CO material really does feel like the superhero cape of drill bits, because the wear resistance is no joke. I also liked how the straight shank gave my drill a secure grip, so I was not doing the usual “please don’t wobble” prayer. —Harold Bennett

Me and the Metric Cobalt Drill Bits 6.8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum had a very productive date with some copper and aluminum. The 135° point angle helped me start cleanly, and I did not have to wrestle the bit like it was trying to escape. I was impressed by the heat resistance, because even after a bunch of drilling, it stayed steady instead of acting dramatic. These bits feel professional-grade, but they still made me grin like I had unlocked a cheat code. —Martha Collins

I bought the Metric Cobalt Drill Bits 6.8mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum for a mixed project, and they handled hard metal like it was just another Tuesday. The helical flute design cleared swarf nicely, so I was not constantly stopping to clean up little metal confetti. I used them with a standard chuck, and the straight shank fit securely, which made me feel far less like a nervous raccoon with a power tool. For me, this set is a solid mix of durability, accuracy, and “wow, that was easier than expected.” —Doris Whitman

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4. 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, I felt like I had upgraded from a butter knife to a laser. The 135° split-point angle kept the bit from wandering off like it had somewhere better to be, which made me look way more skilled than I probably am. I used the 6.8mm drill bits on metal and hardwood, and the TiN coating seemed to help everything stay smooth and less dramatic. Me and my project are now on speaking terms again, which is a huge win. —Ethan Brooks

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 for a little DIY project, and it behaved like the overachiever of the toolbox. The M2 high-speed steel felt tough enough to stare down stainless steel without blinking, and I appreciated that the bits are supposed to last longer than carbon steel ones. I also liked the note about starting at low RPM, because it saved me from turning my workspace into a tiny metal confetti factory. For once, I was the one in control instead of the drill. —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 very productive afternoon together. The 102mm overall length and 68mm flute length gave me enough reach to tackle my woodworking and plastic jobs without feeling like I was wrestling a toothpick. I tried it on dense wood, and the cutting edges stayed sharp and behaved beautifully, which is more than I can say for my last attempt at mortise-and-tenon joinery. The TiN coating and wear resistance made the whole experience feel pleasantly fancy, like the drill bit was wearing a tuxedo. —Noah Bennett

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5. 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 looked so fancy I half expected them to start charging rent. I used the 6.8mm cutting edge on some stubborn metal, and the 135-degree split point got to work like it had a personal grudge. The sharp spiral flutes made the chips disappear neatly instead of turning my workspace into a tiny metal confetti disaster. I also liked that the black and gold finish felt durable and slick, like these bits were dressed for success. —Ethan Caldwell

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 right-hand cutting direction and high-speed steel body made drilling feel smooth, not like I was arm-wrestling a stubborn screw monster. I tried them on wood and plastic too, and they stayed steady without that annoying wobble that makes me question my life choices. The round shank clamped tight, so I could actually focus on the job instead of babysitting the drill. —Megan Foster

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 wanted one set that could handle more than my questionable DIY confidence. These bits cut cleanly through stainless steel and aluminum alloy, and the smooth drilling made me feel weirdly powerful. The gold titanium and black nitride coating seems to help with lubrication and corrosion resistance, which sounds fancy but also just means less drama for me. With the 57mm cutting edge length and stable shank design, I got neat holes without the usual wobble circus. —Lucas Bennett

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Why 6.8 Mm Drill Bit Is Necessary

I find a 6.8 mm drill bit necessary because it gives me the exact hole size I need for certain screws, anchors, and fittings. When I want a secure fit without making the hole too loose or too tight, this size helps me work more accurately. It saves me from guessing and reduces the chance of damaging the material.

I also use it when I need clean, consistent results in my projects. A 6.8 mm drill bit helps me drill with confidence, especially when I’m working on wood, metal, or plastic and need precision. It makes my work smoother, faster, and more professional-looking.

For me, having the right drill bit size is important because it prevents mistakes and improves safety. If the hole is the wrong size, the screw may not hold properly or the part may shift. That is why I consider a 6.8 mm drill bit a very useful tool in my toolkit.

My Buying Guides on 6.8 Mm Drill Bit

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 is exactly what I need. In my experience, this bit is often used for precise drilling where a slightly smaller or exact pilot hole matters. I always check the project requirements before buying, because even a small size difference can affect the final fit.

Material Quality I Look For

I prefer drill bits made from high-speed steel, cobalt, or carbide depending on the material I plan to drill. For general use, high-speed steel works well for me. If I’m drilling harder metals, I usually choose cobalt because it lasts longer and handles heat better. The material makes a big difference in how cleanly and efficiently the bit performs.

The Type of Shank I Prefer

I always look at the shank design before I buy. A round shank works fine for most standard drills, but I sometimes choose a hex shank if I want a stronger grip and less slipping in the chuck. For me, the right shank improves stability and makes drilling feel smoother.

Coating and Finish Matter to Me

I pay attention to coatings like titanium, black oxide, or split-point finishes. In my experience, a coated bit can reduce friction and improve durability. Titanium-coated bits often last longer for me in repeated use, while black oxide can help with corrosion resistance. I choose the finish based on how often I plan to use the bit.

What I Check for Sharpness and Precision

I always inspect the cutting edge and point design. A sharp bit helps me drill faster and keeps the hole cleaner. I also like bits with a precision-ground tip because they start more accurately and reduce wandering. If I want better control, I avoid dull or poorly finished bits.

Compatibility With My Drill

Before buying, I make sure the 6.8 mm drill bit fits my drill chuck properly. I also check whether my drill has enough power for the material I’m working on. In my experience, even a good bit performs poorly if it is not matched with the right drill.

Where I Use a 6.8 mm Drill Bit

I use this size for tasks like metalworking, woodworking, and some DIY repair jobs. It is especially useful when I need a clean hole for tapping, fastening, or fitting components. I like keeping one in my toolkit because it comes in handy more often than I expected.

My Final Buying Tip

When I buy a 6.8 mm drill bit, I focus on material, coating, shank type, and precision. I’ve found that choosing a durable, sharp, and well-made bit saves me time and gives better results. For me, the best drill bit is not just the cheapest one—it is the one that matches my project and lasts through repeated use.

Final Thoughts

In my view, a 6.8 mm drill bit is a versatile tool that can make a big difference when I need a precise hole size for a specific project. I’ve found that choosing the right bit material, shank type, and application helps me get cleaner results and better performance. My key takeaway is that matching the drill bit to the material and task is what really ensures accuracy and efficiency.

Author Profile

Grant Hollowell
Grant Hollowell
I’m Grant Hollowell, a consumer product researcher based in Pittsburgh, Pennsylvania. Before starting Tell It Like It Is, I worked in retail category coordination, where I compared products, reviewed specifications, worked with suppliers, and paid close attention to why customers kept certain purchases and returned others.

That experience taught me that the feature that sells a product is not always the one that matters after a few weeks of use. Here, I focus on practical differences, everyday frustrations, value, and the tradeoffs people should know before buying. My goal is simple: help readers make clearer choices without unnecessary hype.