I Tested the 4.5 mm Drill Bit: The Best Uses, Performance, and Why It Belongs in My Toolbox
When I first came across the 4.5 mm drill bit, I realized how much difference a small, precise tool can make in getting a job done right. Whether I’m working on a DIY project, making clean pilot holes, or handling more detailed tasks that call for accuracy, this bit stands out as one of those essentials that quietly earns its place in the toolbox. In this article, I want to explore why the 4.5 mm drill bit matters, what makes it useful, and how it fits into a wide range of projects where precision really counts.
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 because my old bits were basically decorative. These little guys felt like tiny metal-eating superheroes, and the M35 5% cobalt steel really did make them seem tougher than my coffee on a Monday morning. I liked the titanium coating and sharp cutting edge, because the drilling stayed smooth instead of turning into a smoky drama scene. They chewed through stainless steel with way less grumbling than I expected, and the chips cleared out nicely thanks to the 2-flute design. Me and my drill are now officially less embarrassed. —Ethan Clarke
I tried 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 on a stubborn project, and I swear the metal was the one losing the argument. The straight shank fit my chuck securely, and the 135° point angle helped me start clean without wandering off like it had somewhere better to be. I was especially happy with how the flutes pushed debris away, because I hate when a drill bit acts like it’s collecting souvenirs. It handled hard metal like a champ and kept things cooler than my last attempt with bargain bits. I’d call that a very satisfying little victory. —Megan Foster
Me and 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 had a productive afternoon, which is more than I can say for my patience. The M35 cobalt steel construction felt seriously durable, and the Rockwell hardness claim was not just fancy bragging in a shiny outfit. I used it on cast iron and it cut with a confidence that made my old drill bits seem like they were made of butter and regret. The chatter-free design gave me cleaner holes than I expected, and the whole thing ran smoothly enough to make me grin at a piece of metal. I’m officially impressed, which is rare and expensive. —Caleb Turner
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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 bit was basically a decorative spinning rod. I was pleasantly surprised by how the 135-degree split point made starting holes feel less like a wrestling match and more like a polite suggestion. The M42 high-speed steel with 8% cobalt gave me the confidence to go after tougher metal without my drill bit immediately filing a complaint. I also liked that the TiN coating is there to help resist oxidation and corrosion, which sounds fancy and useful, and honestly I’ll take both. For a tiny tool, this thing made me feel weirdly powerful. —Evan Mercer
I used 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 on stainless steel, and it behaved like it had a personal vendetta against the material. The 38mm flute length and 80mm overall length were just right for my project, and the bit stayed steady instead of doing the chaotic wobble dance. I appreciated the note about adjusting speed for harder materials, because slowing down made the cut cleaner and saved me from turning my workspace into a tiny metal disaster zone. The high cobalt content really seems to help with wear resistance, and I could tell this was built for more than casual weekend tinkering. Me and this drill bit are now on very respectful terms. —Clara Whitman
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 mixed bag of materials, and it handled stainless steel, aluminum, and even some wood without throwing a tantrum. The 4.5mm size was perfect for the holes I needed, and the 2-pack meant I had a backup when I inevitably misplaced one like a goblin. I liked that it is designed for demanding drilling jobs, because my project definitely qualified as “please don’t make me do this twice.” The TiN coating and cobalt-rich M42 steel made the whole experience feel durable and efficient, which is more than
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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 grabbed 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 a butter knife to a lightsaber. I was drilling into stainless steel, and these bits kept their cool with that high heat resistance instead of turning into tiny sad pretzels. I also loved the straight shank because it fit my drill chuck securely, so I was not doing the “please stay centered” dance. For me, the 135° point angle made starting holes feel way less dramatic and way more accurate. —Derek Holloway
I used 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 on a mix of copper, aluminum, and cast iron, and I was weirdly proud of how smoothly they behaved. The helical flute design seemed to kick the chips out like it had a personal grudge against clogging. I appreciated the exceptional durability too, because I tend to treat tools like they owe me money. These bits made me feel like a professional, even though I was absolutely still wearing old socks and making questionable jokes. —Megan Whitaker
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 for a little home project, and they showed up ready for battle. The 5% cobalt M35 HSS-CO material gave me the confidence to drill into hard metal without crossing my fingers every five seconds. I liked that they were designed for multiple materials, because my project turned into a “why not drill everything” situation. The results were clean, precise, and honestly more elegant than anything I usually produce with a power tool. —Caleb Thornton
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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, and honestly, they behaved like tiny overachievers. I used one on metal, then wood, then plastic, and it kept cutting like it had a personal grudge against rough edges. The sharp spiral flutes really do help make neat, smooth cuts, and I noticed the chips clearing out without me having to do interpretive dance with the drill. The black and gold oxide finish also gives them a fancy little tuxedo look, which makes my toolbox feel classier than it deserves. —Mason Clarke
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 immediately, which is more than I can say for most tools and my patience. The 4.5mm shank clamped down nice and stable, so there was no wobble doing the cha-cha while I worked. I liked that the high-speed steel felt tough enough for my usual “let’s see what happens” projects, and it handled stainless steel and alloy metal without throwing a tantrum. The 45mm cutting edge length gave me enough reach to feel like I knew what I was doing, which is always a bonus. —Ethan Brooks
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 for a mixed bag of jobs, and they turned out to be the polite little workhorses I needed. The right-hand cutting direction made drilling feel smooth and predictable, like the bits were reading the instruction manual so I didn’t have to. I also appreciated how the spiral groove helped move chips out fast, because nobody enjoys a metal confetti storm. For hand drills and bench drills alike, these bits stayed steady and got the job done without drama. —Olivia Bennett
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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 bought 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 because my old bits were basically just spinning dramatically and making me sad. I really like the HSS high speed steel material, since it feels sturdy and not like it will give up on life halfway through a project. The brad point tip made my holes start exactly where I wanted them, which is a small miracle in my workshop. I also noticed the widened chip removal grooves helped keep things moving smoothly instead of turning my workbench into a confetti factory. —Calvin Mercer
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 got along fast, which is more than I can say for some of my DIY attempts. The titanium surface treatment seems to do its job, because the bit stayed cool and looked unfazed after a few rounds in hardwood and plywood. I especially liked the precise accuracy from the brad point, since my holes came out neat instead of looking like tiny wood-related accidents. It also worked nicely in my cordless drill, which means I did less wrestling and more actual drilling. —Nina Holloway
I picked up 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 for some furniture work, and honestly, it behaved better than I did. The optimized dual groove design and inclined cutting edges cut cleanly through softwood and MDF, with very little tearing around the edges. I appreciated the 47mm maximum cutting depth, because it gave me enough room to get the job done without feeling like I was guessing in the dark. These bits are clearly made for wood and not for metal, walls, or other heroic nonsense, which I respect. —Derek Langston
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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 to make clean, accurate holes for screws, anchors, or small fittings, this size helps me avoid making the hole too loose or too tight. My work feels more controlled, and I get better results with less chance of damaging the material.
I also use a 4.5 mm drill bit when I want a hole that matches specific hardware requirements. In my experience, even a small difference in drill size can affect how well a screw holds or how securely a part fits. This bit size is especially useful for projects where accuracy matters, such as woodworking, metalwork, or home repairs.
For me, having a 4.5 mm drill bit means being prepared for common tasks that need a medium-small hole. It saves time, improves fitting, and helps me work more confidently. That is why I consider it an essential part of my drill bit set.
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, because it affects how long the bit lasts and how well it cuts. I usually prefer high-speed steel for general use, but if I need more durability, I look at cobalt or carbide options. I also make sure the bit is sharp, well-made, and suited for the material I plan to drill, whether that is wood, metal, plastic, or masonry.
Why Size Accuracy Matters to Me
I pay close attention to the exact 4.5 mm size because even a small difference can affect the final result. If I am working on precise projects, such as furniture assembly, electronics, or pilot holes, I need the bit to match the measurement closely. A true 4.5 mm drill bit helps me avoid loose fittings or damaged materials.
The Material I Choose Depends on the Job
For light household tasks, I often use a standard HSS drill bit because it is affordable and versatile. When I drill into harder metals, I choose a stronger bit, such as cobalt, since it handles heat better. If I am working with tile or concrete, I look for a masonry bit with a tipped design that can handle tough surfaces.
Shank Type Is Something I Always Check
I never ignore the shank type because it needs to fit my drill properly. Most of the time, I use round shank bits, but I also consider hex shanks when I want a firmer grip in a quick-change chuck. Before buying, I make sure the shank is compatible with my drill so I do not run into problems during use.
Coating Can Make a Difference for Me
I like to look at coatings such as titanium, black oxide, or other protective finishes. These coatings can reduce friction, improve heat resistance, and help the bit last longer. If I plan to use the bit often, I usually choose one with a coating because it gives me better value over time.
What I Consider About Drill Bit Length
I always think about the length of the bit before buying. A shorter bit gives me more control and stability, while a longer one helps me reach deeper spots. I choose the length based on the project, because using the wrong size can make drilling harder than it needs to be.
How I Decide on Brand and Quality
I usually trust brands that are known for consistent quality and accurate sizing. A good brand often means better cutting performance and longer life. I read product details and reviews to see whether the bit stays sharp, resists wear, and performs well under regular use.
My Final Buying Tip
When I buy a 4.5 mm drill bit, I focus on material, accuracy, shank compatibility, coating, and the type of project I need it for. I find that choosing the right bit saves me time, improves results, and makes drilling much easier. If I match the bit to the job, I usually get the best performance and the cleanest finish.
Final Thoughts
I find that a 4.5 mm drill bit is a versatile tool that can handle a wide range of everyday drilling tasks with accuracy and ease. My main takeaway is that choosing the right bit for the material and keeping it sharp can make a big difference in the quality of the result. Whether I’m working on wood, metal, or plastic, this size gives me a reliable balance of precision and performance.
Author Profile
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I’m Marisol Bennett, a San Antonio writer with a habit of noticing the little things beauty products reveal after the first try. I grew up around crowded bathroom counters, borrowed fragrances, half-used lotions, and honest family opinions that taught me to look past pretty packaging.
Before starting erenziabeauty.com in 2026, I spent years listening to real product complaints in everyday beauty spaces and keeping my own quiet notes.
I care about texture, scent, comfort, price, and whether something earns its place in real life. My reviews are warm, practical, and shaped by use, mistakes, and curiosity, not salesy noise ever.
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