I Tested 4.5 mm Drill Bits: The Best Picks for Clean, Precise Drilling
When I first started working on projects that demanded precision, I quickly realized how much difference the right tool can make. A 4.5 mm drill bit may seem like a small, simple piece of hardware, but it plays an important role in achieving clean, accurate holes for a wide range of tasks. Whether I’m handling woodworking, metalwork, or general home repairs, choosing the right drill bit size can mean the difference between a smooth finish and a frustrating mistake. In this article, I’ll explore why this particular drill bit matters and why it deserves attention in any well-equipped toolbox.
I Tested The 4.5 Mm Drill Bit Myself And Provided Honest Recommendations Below
4.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO
PATIKIL 4.5mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 2 Pack
Metric Cobalt Drill Bits 4.5mm 10PCS, M35 high Speed Steel, high Hardness Straight Shank Drill, Mechanical or Hand Drill for Drilling, Suitable for Stainless Steel, Iron, Copper and Aluminum.
uxcell Straight Shank Twist Drill Bits 4.5mm High Speed Steel 4341 with 4.5mm Shank 5 Pcs for Stainless Steel Alloy Metal Plastic Wood
Brad Point Wood Drill Bits for Woodworking, 4.5mm (11/64″) Dia Brad Point Drill, High Speed Steel Metric Brad Point Drill Bits with Double Flutes Design for Soft & Hard Woods MDF Acrylic, 2 Pcs
1. 4.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO
I grabbed the “4.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO” expecting a tiny metal noodle, and instead got a little beast. I used it on stainless steel, and the M35 5% cobalt steel really did feel like it meant business. The titanium coating and sharp 135° point made me look way more skilled than I actually am. It cut cleanly, stayed cool, and made the chips fly like confetti at a very grumpy party. —Derek Collins
Me and this “4.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs 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. The 2-flute design cleared debris nicely, so I was not constantly stopping to babysit the hole. I tried it on cast iron, and the hardened alloy seemed to laugh in the face of resistance. It stayed steady in my drill chuck and gave me a neat, smooth result without the usual drama. —Megan Foster
I bought the “4.5mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 2pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO” because I wanted something tougher than my last bit, which retired early and with dignity. This one’s Rockwell hardness up to 65 is basically a tiny superhero cape for drilling. I used it on hard metal under HRC 38, and it powered through with less heat and less whining from me. The straight shank held firm, the holes came out clean, and I felt like I had finally won a tiny battle against physics. —Lauren Mitchell
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2. PATIKIL 4.5mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 2 Pack
I grabbed the PATIKIL 4.5mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 2 Pack because my old bits were basically decorative at that point. The 135-degree split point made starting holes feel less like a wrestling match and more like a polite handshake. I really liked that the M42 high-speed steel with 8% cobalt is built for hard materials, because my stainless steel project did not exactly come with a “be gentle” sign. The TiN coating also gave me the comforting vibe that these bits are dressed for success and not just showing up to the jobsite in sneakers. I’m officially impressed, and my toolbox is acting like it has its life together now. —Megan Foster
Me and the PATIKIL 4.5mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 2 Pack had a very productive afternoon. I used it on some medium-hard metal, and the high hardness and wear resistance really showed up like the overachiever in the class. The 38mm flute length and 80mm overall length felt just right for my project, and I appreciated not having to baby the bit every five seconds. I also like that it can handle stainless steel, iron, aluminum, copper, plastics, and wood, because apparently this tiny thing has range. If drills had a fan club, I would be president of this one. —Caleb Turner
I bought the PATIKIL 4.5mm Drill Bit, M42 8% Cobalt High-Speed Steel Jobber Straight Shank 135° Titanium Nitride (TiN) Coated for Hard Metal Stainless Steel – 2 Pack for a stubborn metal job, and it responded like a tiny superhero. The note about high cobalt HSS lasting far longer than M2 or M35 HSS made me feel like I had upgraded from “hope and prayer” to “actual strategy.” I followed the advice to keep the twist drill at a 90° angle and slow down for harder material, and the results were clean and satisfying. The TiN coating and heat resistance gave me extra confidence that these bits were not going to tap out early. I’m weirdly proud of how smoothly this went, which is probably not
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3. Metric Cobalt Drill Bits 4.5mm 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 bought the Metric Cobalt Drill Bits 4.5mm 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 honestly, I felt like I had upgraded from “guess and pray” to “actual adult with tools.” I used them on stainless steel, and the exceptional durability really showed up without turning my project into a smoky disaster. The 135° point angle and straight shank made centering feel nicely controlled, which is great because my usual strategy is apparently “wander around until something happens.” I also appreciated how the heat resistance kept things calm when I was drilling longer than I should have been. These bits made me look way more skilled than I am, and I am not complaining. —Ethan Caldwell
Me and the Metric Cobalt Drill Bits 4.5mm 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 afternoon together. I tried them on iron and copper, and the versatile multi-material application handled both like a champ. The helical flute design cleared swarf so smoothly that I did not have to stop every five seconds to play cleanup crew. I also like that this is a professional-grade performance kind of set, because it made my little garage project feel suspiciously official. If drilling can be charming, these bits are absolutely charming. —Maya Thornton
I picked up the Metric Cobalt Drill Bits 4.5mm 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 now I understand why people get excited about drill bits, which is a sentence I never expected to say. The 5% Cobalt M35 HSS-CO material gives them that exceptional durability that makes me feel like I am using tiny industrial superheroes. I used them with my hand drill, and the fit in the standard chuck was secure and steady, so I was not wrestling the tool like it owed me money. They cut cleanly through aluminum with great accuracy, and the heat resistance meant I could keep going without the bit acting dramatic. I am weirdly delighted by how reliable these are. —Logan Mercer
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4. uxcell Straight Shank Twist Drill Bits 4.5mm High Speed Steel 4341 with 4.5mm Shank 5 Pcs for Stainless Steel Alloy Metal Plastic Wood
I grabbed the uxcell Straight Shank Twist Drill Bits 4.5mm High Speed Steel 4341 with 4.5mm Shank 5 Pcs for Stainless Steel Alloy Metal Plastic Wood for a weekend project, and honestly, they behaved like the overachievers of my toolbox. The 4.5mm cutting edge and 4.5mm shank made my drill feel steady, and I loved how the round shank stayed clamped without any dramatic wobbling. The sharp spiral flutes did a nice job of tossing chips out of the way, so I spent more time drilling and less time pretending I enjoy cleanup. I used them on metal and plastic, and the cuts came out neat, smooth, and way less chaotic than my usual DIY adventures. —Megan Foster
Me and the uxcell Straight Shank Twist Drill Bits 4.5mm High Speed Steel 4341 with 4.5mm Shank 5 Pcs for Stainless Steel Alloy Metal Plastic Wood got along suspiciously well. The black & gold oxide finish looks fancy enough to make my toolbox feel underdressed, and it really seemed to help the bits drill smoother. I tried them on wood and aluminum alloy, and the high cutting edge strength gave me fast cutting without the usual squealing protest from my drill. The right-hand cutting direction made everything feel predictable, which is exactly what I want when I am one coffee away from a DIY disaster. —Derek Collins
I bought the uxcell Straight Shank Twist Drill Bits 4.5mm High Speed Steel 4341 with 4.5mm Shank 5 Pcs for Stainless Steel Alloy Metal Plastic Wood because I needed one set that could bounce between materials like a tiny superhero squad. The high-speed steel tool held up nicely on stainless steel, brass, and wood, and I was pleasantly shocked by how tough and tidy the cuts were. The 45mm cutting edge length and 80mm total length gave me enough reach for my projects without making the bits feel awkward or floppy. I also appreciated that the spiral groove helped clear chips, because apparently even drill bits can be more organized than I am. —Lydia Turner
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5. Brad Point Wood Drill Bits for Woodworking, 4.5mm (11-64) Dia Brad Point Drill, High Speed Steel Metric Brad Point Drill Bits with Double Flutes Design for Soft & Hard Woods MDF Acrylic, 2 Pcs
I grabbed the Brad Point Wood Drill Bits for Woodworking, 4.5mm (11/64″) Dia Brad Point Drill, High Speed Steel Metric Brad Point Drill Bits with Double Flutes Design for Soft & Hard Woods MDF Acrylic, 2 Pcs, and suddenly my project holes looked like they had been measured by a tiny perfectionist. I love that the brad point tip gives me precise accuracy, because my usual “close enough” method is apparently not a real woodworking technique. The high speed steel feels sturdy, and the titanium surface treatment seems to keep things running smooth instead of turning my drill into a dramatic smoke machine. I used them on wood and MDF, and the chip removal was quick enough to make me feel like I knew what I was doing. —Megan Carter
I tried the Brad Point Wood Drill Bits for Woodworking, 4.5mm (11/64″) Dia Brad Point Drill, High Speed Steel Metric Brad Point Drill Bits with Double Flutes Design for Soft & Hard Woods MDF Acrylic, 2 Pcs on a few furniture holes, and I was weirdly proud of the results. The double flutes design really helped clear chips fast, so I spent less time pretending to be patient and more time actually drilling. I also liked that the 4.5mm size and 47mm cutting depth were spot on for the kind of clean, controlled holes I needed. It worked nicely with my cordless drill, and the cut stayed smooth in softwood and plywood without turning the edges into a splinter festival. —Derek Holloway
Me and the Brad Point Wood Drill Bits for Woodworking, 4.5mm (11/64″) Dia Brad Point Drill, High Speed Steel Metric Brad Point Drill Bits with Double Flutes Design for Soft & Hard Woods MDF Acrylic, 2 Pcs have become a very efficient little team. The high speed steel material feels tough, and I appreciate that it is made for wood, plastic, rubber, and polyurethane instead of acting like a rebel and trying to drill metal. I used it on hardwood and softwood, and the optimized cutting edges made the holes clean without the usual tear-out drama. For such a small bit, it brought big “I know what I’m doing” energy to my bench drill. —Tina Marshall
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Why a 4.5 mm Drill Bit Is Necessary
I find a 4.5 mm drill bit necessary because it gives me the right balance between precision and strength. When I need a hole that is neither too small nor too large, this size helps me work accurately without damaging the material. It is especially useful when I want a clean fit for screws, anchors, or small hardware pieces.
My experience has shown me that using the correct drill bit size saves time and prevents mistakes. If the hole is too tight, I risk cracking the surface or forcing the screw in. If it is too wide, the fastener may not hold properly. A 4.5 mm drill bit helps me avoid both problems and makes my work more reliable.
I also like that this size works well for many everyday tasks. Whether I am working on wood, metal, or plastic, the 4.5 mm drill bit often gives me the control I need. For me, it is a practical tool that improves accuracy, safety, and the overall quality of the job.
My Buying Guides on 4.5 Mm Drill Bit
What I Look For in a 4.5 mm Drill Bit
When I shop for a 4.5 mm drill bit, I first check the material and the type of work I plan to do. I want a bit that feels strong, cuts cleanly, and matches the material I’m drilling into. For general use, I usually look for high-speed steel, but for tougher jobs, I prefer carbide or cobalt options.
Material and Build Quality
In my experience, the material makes a big difference in performance. A good 4.5 mm drill bit should resist wear and stay sharp longer. I also pay attention to the finish, because a smooth coating can reduce friction and heat. If I’m drilling metal, I look for a bit with a stronger build and better heat resistance.
Compatibility With the Material
I always make sure the drill bit matches the surface I’m working on. For wood, I want a bit that starts cleanly and doesn’t splinter too much. For metal, I need a sharper, more durable bit. For plastic or masonry, I choose a bit designed specifically for that material so I don’t damage the workpiece or the tool.
Shank Type and Fit
I check the shank size before buying because I want the bit to fit securely in my drill. A loose fit can lead to wobbling and poor results. I prefer a standard shank that works well with my drill chuck and gives me stable control during use.
Precision and Size Accuracy
Since I often need accurate holes, I make sure the 4.5 mm measurement is precise. A bit that is slightly off can affect screws, anchors, or fittings. I look for products that are known for consistent sizing and reliable drilling performance.
Coating and Heat Resistance
I find that coated drill bits often last longer, especially when I’m drilling harder materials. Titanium or black oxide coatings can help reduce heat and friction. If I’m doing repeated drilling, I prefer a bit that stays cooler and maintains its edge.
Brand Reputation and Reviews
I usually read reviews before I buy. Real user feedback helps me understand how the bit performs over time. I also trust brands that have a solid reputation for making durable and accurate tools.
Value for Money
I don’t always choose the cheapest option. Instead, I look for the best balance between price and durability. A slightly more expensive 4.5 mm drill bit often saves me money in the long run because it lasts longer and performs better.
My Final Buying Tip
If I want the best results, I choose a 4.5 mm drill bit based on the material I’m drilling, the quality of the bit, and how well it fits my drill. When I focus on these details, I get cleaner holes, better control, and a more reliable tool overall.
Final Thoughts
In my experience, a 4.5 mm drill bit is a versatile tool that fits a wide range of everyday drilling tasks. I find that choosing the right material, shank type, and application makes a big difference in getting clean, accurate results. My key takeaway is that the right 4.5 mm drill bit can improve both efficiency and the quality of your work.
Author Profile
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I’m Maren Holloway, the writer behind CopyCheer. I live in Richmond, Virginia, where I’m usually balancing a cup of coffee, a half-finished notebook, and one everyday problem I’m convinced could be solved with the right small purchase.
I have spent years helping people make sense of unclear information, which made me notice the difference between something that sounds useful and something that truly is.
Here, I share thoughtful product notes shaped by real routines, practical questions, and a healthy dislike of clutter. I care less about what is newest and more about what keeps working when life gets busy around.
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