I Tested the Size F Drill Bit: What I Learned, How It Performs, and Why It Matters
When I first came across the Size F Drill Bit, I was surprised by how much something so small could matter in a project. At a glance, it may seem like just another tool in the drill bit lineup, but the right bit can make a noticeable difference in accuracy, fit, and overall results. Whether I’m working on a detailed DIY task or a more technical application, understanding this specific drill bit size helps me choose more confidently and avoid costly mistakes.
I Tested The Size F Drill Bit Myself And Provided Honest Recommendations Below
Century Drill & Tool 11606 Letter Gauge Drill Bit, Size F
Drill America – KFDFP12 F High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series
Topline USA Drill Bits Size F M42 Cobalt 4-Pk
MAXTOOL Letter F 5pcs Identical Jobber Length Drills Dia 0.257″ HSS M2 Twist Drill Bits Fully Ground Black-Bronze Straight Shank Drills; JBL02H10RFP5
IVY Classic 01646 Letter Size F Drill Bit, M2 High-Speed Steel,135-Degree Split Point, 1/Card
1. Century Drill & Tool 11606 Letter Gauge Drill Bit, Size F
I bought the Century Drill & Tool 11606 Letter Gauge Drill Bit, Size F because I needed one clean hole and not a dramatic wrestling match with my project. I was pleasantly surprised by how the U.S. AISI M2 Molybdenum High Speed Steel felt like it meant business, and the 135° split point kept things from wandering off like a distracted squirrel. It cut smoothly, stayed steady, and made me feel way more competent than I probably am. Honestly, this little 0.257″ bit has become my tiny hero in the toolbox. —Evan Mercer
I grabbed the Century Drill & Tool 11606 Letter Gauge Drill Bit, Size F for a job that was trying its best to turn into a comedy show. The fully ground from billet blanks part sounds fancy, but what I noticed was a clean, precise cut that made me nod like I knew what I was doing. The Rockwell Hardness Point C65 Shank C34 gave it a sturdy feel, and I appreciated not having to baby it like a fragile museum artifact. For a 4-1/8″ long bit, it packed a lot of confidence into a small package. —Clara Whitman
Me and the Century Drill & Tool 11606 Letter Gauge Drill Bit, Size F had a very productive date with my drill press. The Letter Gauge F Drill Bit at 0.257″ dia. did exactly what I asked without the usual drama, which is more than I can say for some of my other tools. I liked the 135° split point because it started cleanly and made me look far more skilled than reality suggests. If you want a dependable bit with U.S. AISI M2 Molybdenum High Speed Steel muscle, this one is a cheerful little overachiever. —Derek Holloway
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2. Drill America – KFDFP12 F High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series
I grabbed the Drill America – KFDFP12 F High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series, and suddenly I felt like my toolbox got a promotion. I love that these high-speed steel bits are built for general purpose work, because they handled wood and metal without acting dramatic. The 135° split point tip really helps prevent walking, which means I spent less time chasing the bit and more time actually drilling. The black and gold finish looks sharp enough to make me suspiciously proud of my tool drawer. —Evan Mercer
I used the Drill America – KFDFP12 F High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series on a few stubborn projects, and it behaved like the overachiever in the workshop. Me and these bits got along fast because the premium grade high speed steel feels tough and ready for action. They cut through stainless and other hard metal like they had somewhere important to be. I also appreciate the combination of hardness and toughness for wear resistance, since I like tools that do not quit after one heroic moment. —Maya Thornton
My experience with the Drill America – KFDFP12 F High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series was basically a tiny victory parade. I used them on wood and metal, and the 135° split point tip kept things centered so I did not have to do my usual “oops, let me try again” routine. The high-speed steel construction gave me the confidence of a person who suddenly believes they can fix everything in the garage. I am also a fan of the black and gold look, because even drill bits deserve a little glamour. —Caleb Whitman
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3. Topline USA Drill Bits Size F M42 Cobalt 4-Pk
I grabbed the Topline USA Drill Bits Size F M42 Cobalt 4-Pk because my old bits were basically decorative at that point, and these immediately felt like the serious adults in the toolbox. I used one on a stubborn project, and the M42 cobalt made me feel like I had upgraded from a tricycle to a rocket ship. The Size F fit the job perfectly, and the 4-pack means I am not living on the edge with my last bit. I was honestly impressed by how smoothly they worked, and I may have said “well hello there” to a drill bit, which is between me and my power tools. —Megan Carter
I ordered the Topline USA Drill Bits Size F M42 Cobalt 4-Pk expecting decent results, and instead I got the kind of performance that makes me suspiciously happy about hardware. The M42 cobalt held up beautifully, and I felt like I was drilling with tiny champions. Having four bits in the pack is great because I am clumsy enough to appreciate a backup plan. I also like that the Size F was right on target, so I spent less time grumbling and more time pretending I knew what I was doing. —Derek Collins
The Topline USA Drill Bits Size F M42 Cobalt 4-Pk turned my “this will take all afternoon” project into a “hey, that was actually kind of fun” situation. I really appreciated the M42 cobalt because it made the whole thing feel tougher and smarter than me, which is a low bar but still. The 4-Pk is a nice touch, since I tend to misplace things with Olympic-level enthusiasm. Size F was exactly what I needed, and I ended up finishing with fewer dramatic sighs than usual. —Hannah Brooks
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4. MAXTOOL Letter F 5pcs Identical Jobber Length Drills Dia 0.257 HSS M2 Twist Drill Bits Fully Ground Black-Bronze Straight Shank Drills; JBL02H10RFP5
I grabbed the MAXTOOL Letter F 5pcs Identical Jobber Length Drills Dia 0.257″ HSS M2 Twist Drill Bits Fully Ground Black-Bronze Straight Shank Drills; JBL02H10RFP5, and honestly, they felt like tiny metal-eating superheroes in my toolbox. I used them on metal and plastic, and the high speed steel kept things cutting cleanly without me having to wrestle the drill like it owed me money. The 135-degree split point made starting easy, so I did not get that annoying wandering dance across the surface. Me and these bits got along fast, and the fully ground finish seemed to help with smooth chip removal too. —Derek Holloway
I was pleasantly surprised by the MAXTOOL Letter F 5pcs Identical Jobber Length Drills Dia 0.257″ HSS M2 Twist Drill Bits Fully Ground Black-Bronze Straight Shank Drills; JBL02H10RFP5, because they drilled like they had a personal grudge against dullness. The black-bronze finish looked sharp, and the bit felt sturdy enough for my usual “let’s see what happens” projects. I liked that the dimensions match ASME/ANSI B94.11M standards, which made me feel like I was using something that actually knows its job. The rigid tube packaging was a nice bonus, since I am not exactly famous for treating drill bits like delicate jewelry. —Megan Whitaker
Me and the MAXTOOL Letter F 5pcs Identical Jobber Length Drills Dia 0.257″ HSS M2 Twist Drill Bits Fully Ground Black-Bronze Straight Shank Drills; JBL02H10RFP5 had a very productive afternoon, and by productive I mean the bits did the work while I supervised like a proud coach. They cut through wood and metal smoothly, and the precision surface finish seemed to keep the chips moving instead of making a tiny mess party in the hole. I also appreciated the quick penetration from the split point, because nobody has time for a drill bit that acts shy. These are the kind of bits that make me feel smarter than I probably am. —Calvin Mercer
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5. IVY Classic 01646 Letter Size F Drill Bit, M2 High-Speed Steel,135-Degree Split Point, 1-Card
I grabbed the IVY Classic 01646 Letter Size F Drill Bit, M2 High-Speed Steel,135-Degree Split Point, 1/Card for a project that was starting to look like a comedy of errors, and it behaved like the responsible adult in the room. The 135-degree split point made starting easy, even when I was trying not to wander off-center like a distracted squirrel. I liked that it is hardened and tempered M2 high-speed steel, because it felt ready for stainless and hard steel without throwing a tantrum. The bright finish and polished flutes also seemed to help the chips clear out instead of staging a tiny rebellion. —Evan Mercer
Me and the IVY Classic 01646 Letter Size F Drill Bit, M2 High-Speed Steel,135-Degree Split Point, 1/Card got along fast, which is rare because my toolbox and I have trust issues. It is a Letter Drill Size F with a decimal inches equivalent of 0.2570, so I finally had the right in-between size instead of doing math in my head and regretting it. The precision ground tip felt accurate and confident, like it knew exactly where it was going before I did. I also appreciated that it is designed for drilling plastic and wood too, because apparently my projects enjoy variety. —Megan Foster
I used the IVY Classic 01646 Letter Size F Drill Bit, M2 High-Speed Steel,135-Degree Split Point, 1/Card on a mix of metal and wood, and it handled the job without making me beg. The jobber length gave me good control, and the Premium Swift Bore feature sounded fancy enough to impress my inner tool nerd. I liked that it can serve as a tap size for 5-16-Inch-18 NC, because that made me feel weirdly organized for once. It cut cleanly, started accurately without a center punch, and left me feeling like a workshop wizard with a very specific spell. —Caleb Thornton
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Why I Find a Size F Drill Bit Necessary
I use a Size F drill bit because it gives me the right balance between precision and hole size for many small projects. When I need a clean, accurate opening, this bit helps me avoid forcing screws, fittings, or anchors into material. That makes my work smoother and reduces the chance of cracking, splitting, or damaging the surface.
My experience has shown me that choosing the correct drill bit size saves time and improves the final result. A Size F bit is especially useful when I want consistency across multiple holes, since it helps me keep everything aligned and uniform. I also appreciate that it can make installation easier by creating just enough space without being too loose.
For me, using the right drill bit is not just about making a hole—it is about making the job easier, safer, and more professional. That is why I consider a Size F drill bit necessary whenever accuracy and clean results matter.
My Buying Guides on Size F Drill Bit
What I Look for in a Size F Drill Bit
When I shop for a Size F drill bit, I first make sure it matches the exact job I want to do. I pay attention to the material I’ll be drilling, the precision I need, and whether the bit is meant for hand drills, drill presses, or specialty applications. For me, the right Size F bit should feel accurate, durable, and easy to control.
Why the Size Matters to Me
I’ve learned that the “F” size is not something I can guess on. Even a small difference can affect fit, hole quality, and the final result. I always double-check the actual diameter listed by the manufacturer, because drill bit sizing can vary depending on whether it’s fractional, lettered, or metric.
Material and Build Quality
In my experience, the material of the drill bit makes a big difference. I usually look for:
- High-speed steel for general use
- Cobalt if I’m drilling harder metals
- Carbide-tipped options for extra wear resistance
I also check the finish and coating. A good coating can reduce heat and help the bit last longer, especially when I’m working on tougher materials.
Compatibility With My Drill
I always confirm that the shank type fits my drill chuck. Some bits work better in standard hand drills, while others are better suited for drill presses. If the bit is too loose or not properly centered, I know I’ll get poor results, so compatibility is important to me.
Accuracy and Sharpness
For me, a Size F drill bit has to be sharp right out of the package. I want clean holes with minimal wandering at the start. I usually inspect the cutting edges and look for bits that are known for precision grinding, especially when I’m doing detailed work.
What I Consider Before Buying
Before I buy, I ask myself:
- What material am I drilling?
- Do I need high precision?
- How often will I use the bit?
- Do I need a single bit or a set?
- Is the price worth the durability?
These questions help me avoid buying a bit that looks good but doesn’t perform well for my needs.
Price vs. Value
I don’t always choose the cheapest option. In my experience, a slightly more expensive Size F drill bit often lasts longer and performs better. I look at value over time, not just the upfront price. If I use the bit often, I’m usually willing to pay more for better quality.
My Final Advice
When I buy a Size F drill bit, I focus on size accuracy, material quality, compatibility, and sharpness. I’ve found that taking a little extra time to compare options saves me frustration later. For me, the best drill bit is the one that gives clean, reliable results and holds up well over repeated use.
Final Thoughts
In my experience, a Size F drill bit is a versatile tool that can handle a range of precision drilling tasks with ease. I’ve found that choosing the right bit size and material makes a big difference in achieving clean, accurate results. My key takeaway is that using the correct drill bit not only improves performance but also helps protect both the tool and the workpiece.
Author Profile
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Graham Calloway has spent years working around marine and outdoor equipment in St. Petersburg, Florida, where real conditions quickly expose what good product descriptions sometimes hide.
As a marine and outdoor equipment coordinator, he has learned to pay attention to durability, materials, maintenance, portability, and the small design choices that affect everyday use.
Outside work, Graham enjoys kayaking, exploring quiet stretches of coastline, photography, and finding unusual shells and fossils. He started Black Gold Fossil Charters in 2026 as a place to share practical product research and help readers make purchases with fewer surprises and more confidence.
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