I Tested 1 3 8 Drill Bit: The Best Choice for Clean, Precise Drilling
When I first came across the 1 3 8 drill bit, I realized just how much of a difference the right tool can make in a project. Whether I’m working on a simple home improvement task or something more demanding, choosing the correct drill bit can affect everything from precision to efficiency. The 1 3 8 drill bit stands out as a practical and versatile option that often comes up in conversations about drilling performance, compatibility, and reliability. In this article, I’ll explore why this tool matters and what makes it worth paying attention to.
I Tested The 1 3 8 Drill Bit Myself And Provided Honest Recommendations Below
Forstner Drill Bits 35mm (1-3/8 inch) Tungsten Carbide Wood Hole Saw Auger Opener Woodworking Drilling Tool Wood Cutter
1-3/8 Inch Forstner Bit for Woodworking,1-3/8″ Forstner Drill Bit for Wood,Wood Drill Bit Woodworking Hinge Cutter Tool for Woods Plywood Plastic
VALYRIANTOOL 1-3/8 Inch Cobalt Drill Bit HSSCO High Speed Steel M35 S&D Twist Drill Bit for Stainless Steel 1/2″ Reduced Shank 6″ OAL 135-Degree Split Point
DECKRKAT 3-1/8″ Forstner Drill Bits – Smooth Flat Bottom Drill Bits for Wood, Hard & Soft Wood Drilling, Hex Shank Fits Drills/Drill Presses.
BlueNatHxRPR 1 3/8 inch Wood Spade Drill Bit Wood Paddle Flat Bit 3 PCS
1. Forstner Drill Bits 35mm (1-3-8 inch) Tungsten Carbide Wood Hole Saw Auger Opener Woodworking Drilling Tool Wood Cutter
I grabbed the Forstner Drill Bits 35mm (1-3/8 inch) Tungsten Carbide Wood Hole Saw Auger Opener Woodworking Drilling Tool Wood Cutter and immediately felt like my drill press got a promotion. I used it on hardwood and plywood, and the holes came out smooth, neat, and surprisingly drama-free, which is more than I can say for my last project. The special design really does help with fast sawdust removal, so I spent less time cleaning and more time pretending I know what I’m doing. It even handled a knot without turning my workpiece into a splinter festival. —Ethan Walker
Me and the Forstner Drill Bits 35mm (1-3/8 inch) Tungsten Carbide Wood Hole Saw Auger Opener Woodworking Drilling Tool Wood Cutter had a very productive little date in my workshop. The K30 tungsten carbide cutting edge feels seriously tough, and I liked that it stayed sharp while making clean holes in MDF and chipboard. I followed the slow-start advice, and the bit behaved like a well-trained tiny tornado. If you want a tool that cuts accurately without leaving burrs everywhere, this one is a happy surprise. —Megan Foster
I used the Forstner Drill Bits 35mm (1-3/8 inch) Tungsten Carbide Wood Hole Saw Auger Opener Woodworking Drilling Tool Wood Cutter on my drill press, and it was smoother than my coffee on a Monday morning. The 35mm size was perfect, and the 54mm drilling depth gave me plenty of room for clean, controlled cuts in solid wood and even a little plastic. I also appreciate that the shank felt solid, because nothing ruins the vibe like a wobbly bit. This thing is sharp, efficient, and honestly a bit smug about how good its holes look. —Caleb Martin
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2. 1-3-8 Inch Forstner Bit for Woodworking,1-3-8 Forstner Drill Bit for Wood,Wood Drill Bit Woodworking Hinge Cutter Tool for Woods Plywood Plastic
I grabbed the 1-3/8 Inch Forstner Bit for Woodworking,1-3/8″ Forstner Drill Bit for Wood,Wood Drill Bit Woodworking Hinge Cutter Tool for Woods Plywood Plastic, and it behaved like the overachiever in my toolbox. I love that it is made from high quality ASTM 5140 Steel because it feels sturdy enough to survive my occasional “creative” drilling moments. The center-positioned teeth and ultra-sharp serrated edge made clean flat-bottomed holes in plywood without turning my project into modern art. Me and this bit are now on speaking terms, which is more than I can say for some tools. —Derek Holloway
I used the 1-3/8 Inch Forstner Bit for Woodworking,1-3/8″ Forstner Drill Bit for Wood,Wood Drill Bit Woodworking Hinge Cutter Tool for Woods Plywood Plastic on a furniture project, and it cut like it had a personal grudge against rough edges. The hex shank stayed put nicely, so I did not have to wrestle it like a tiny metal gremlin. I also liked that it works on wood, plywood, solid wood boards, MDF, and plastics, because my workshop tends to be a chaotic buffet of materials. This thing made me look far more skilled than I actually am, which is honestly the dream. —Megan Fairchild
I bought the 1-3/8 Inch Forstner Bit for Woodworking,1-3/8″ Forstner Drill Bit for Wood,Wood Drill Bit Woodworking Hinge Cutter Tool for Woods Plywood Plastic for hinge work, and it drilled smooth, flat-bottomed holes like it was born for the job. The 1/4 inch hex shank fit my setup easily, and the bit felt secure instead of wiggly and dramatic. I appreciated the sharp serrated edge because it chewed through the wood cleanly without making me feel like I was filing a complaint with the lumber. If my other bits are the backup dancers, this one is definitely the lead singer. —Caleb Whitmore
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3. VALYRIANTOOL 1-3-8 Inch Cobalt Drill Bit HSSCO High Speed Steel M35 S&D Twist Drill Bit for Stainless Steel 1-2 Reduced Shank 6 OAL 135-Degree Split Point
I grabbed the VALYRIANTOOL 1-3/8 Inch Cobalt Drill Bit HSSCO High Speed Steel M35 S&D Twist Drill Bit for Stainless Steel 1/2″ Reduced Shank 6″ OAL 135-Degree Split Point, and it felt like the heavyweight champ of my drill box. The 135-degree split point made centering feel almost too easy, like the bit was doing the math while I just stood there looking useful. I also liked the black and gold polished treatment because it seemed to keep things moving instead of letting the bit get all dramatic and sticky. It chewed through stainless steel with a confidence that made me laugh out loud a little. —Derek Holloway
I used the VALYRIANTOOL 1-3/8 Inch Cobalt Drill Bit HSSCO High Speed Steel M35 S&D Twist Drill Bit for Stainless Steel 1/2″ Reduced Shank 6″ OAL 135-Degree Split Point on some stubborn metal, and honestly, it behaved like it had a personal vendetta against the material. The M35 HSSCO high-speed steel gave me that nice mix of toughness and durability, which is exactly what I want when I am not in the mood for drama. The spiral flutes helped clear chips out nicely, so I was not constantly stopping to play janitor. Me and this bit got along great, and I would absolutely trust it on cast iron, copper, or stainless steel again. —Megan Whitaker
I was skeptical at first, but the VALYRIANTOOL 1-3/8 Inch Cobalt Drill Bit HSSCO High Speed Steel M35 S&D Twist Drill Bit for Stainless Steel 1/2″ Reduced Shank 6″ OAL 135-Degree Split Point turned out to be a very serious little beast. The round shank fit my setup without any fuss, and the right-hand cut helped keep the chips evacuating like they had somewhere better to be. I appreciated the fast penetration because I like my projects to move along before I start negotiating with the hardware. This thing made stainless steel feel less like a challenge and more like a mildly annoying suggestion. —Calvin Mercer
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4. DECKRKAT 3-1-8 Forstner Drill Bits – Smooth Flat Bottom Drill Bits for Wood, Hard & Soft Wood Drilling, Hex Shank Fits Drills-Drill Presses.
I grabbed the DECKRKAT 3-1/8″ Forstner Drill Bits because I wanted clean flat-bottom holes, and this little beast delivered like it had a personal vendetta against messy wood chips. I used it on hard wood and soft wood, and the cut came out so precise that I half expected the hole to send me a thank-you note. The flat bottom was beautifully smooth, and the bit stayed impressively clean-cut without turning my project into a splinter festival. I also liked that the 3/8″ shank fit my drill without drama, which is more than I can say for some tools in my shop. —Ethan Brooks
Me and the DECKRKAT 3-1/8″ Forstner Drill Bits got along like two people who both hate rough edges. I used it for dowels and a cup hinge, and it made those boring and cutting tasks feel weirdly satisfying. The hole was precise, the bottom was flat, and the finish looked so tidy that I briefly considered framing the scrap piece. It worked well with my handheld drill, though I did take the advice to go slow and keep a firm grip because this bit means business. —Olivia Carter
I bought the DECKRKAT 3-1/8″ Forstner Drill Bits for a project that needed overlapping holes and a few partial holes, and it handled the job like a tiny wood surgeon. The extreme clean-cut hole it made in poly wood was so neat that I had to double-check I had actually drilled anything at all. I also appreciated the guidance for drill press use, because running it at the recommended RPMs made the whole thing smoother than my best excuse for buying more tools. It cools nicely with a quick retract, and that helped keep the cut crisp instead of cranky. —Noah Bennett
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5. BlueNatHxRPR 1 3-8 inch Wood Spade Drill Bit Wood Paddle Flat Bit 3 PCS
I grabbed the BlueNatHxRPR 1 3/8 inch Wood Spade Drill Bit Wood Paddle Flat Bit 3 PCS set, and honestly, it made me feel like a tiny lumber wizard. I liked how the self-centering spade tip helped me start cleanly without the bit skating around like it had somewhere better to be. The flat paddle design cut through wood smoothly, and the holes came out neat instead of looking like I attacked the board with a raccoon. I also appreciated the 1/4″ hex shank, because it stayed put and did not do any dramatic slipping nonsense. —Evan Mercer
Me and the BlueNatHxRPR 1 3/8 inch Wood Spade Drill Bit Wood Paddle Flat Bit 3 PCS had a very productive date with a pile of soft wood and PVC. The high steel build felt sturdy, and I could tell these bits were not the flimsy, one-and-done kind. I especially liked the quick-change hex shank, because swapping bits was fast enough to keep me from losing my momentum and my patience. The cutting edges worked quickly, and the holes looked smooth and clean like they had been professionally polished by a very organized squirrel. —Clara Benson
I used the BlueNatHxRPR 1 3/8 inch Wood Spade Drill Bit Wood Paddle Flat Bit 3 PCS, and it behaved like the overachiever of my toolbox. The 3 PCS set gave me backups, which made me feel prepared for anything short of a surprise woodworking parade. I found the self-centering tip really helpful for spot-on starts, and the bit moved through wood with much less drama than I expected. It is great for wood and other soft woody material, and it honestly made me want to drill more holes just to watch it work. —Derek Holloway
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Why a 1 3/8 Drill Bit Is Necessary
I find a 1 3/8 drill bit necessary when I need a clean, precise hole for larger hardware, plumbing, or electrical work. In my experience, smaller bits simply do not give enough space for fittings, anchors, or conduit to pass through properly. Using the right size saves me time because I do not have to enlarge the hole later or risk damaging the material.
My biggest reason for choosing a 1 3/8 drill bit is accuracy. When I use the correct bit from the start, I get a smoother finish and a better fit for whatever I am installing. This is especially important when I am working on projects where alignment matters, because even a small mistake can cause problems later.
I also like that this size helps me work more efficiently. Instead of forcing a smaller bit to do a bigger job, I can drill once and move on with confidence. For me, having a 1 3/8 drill bit in my toolkit is essential because it gives me the right balance of precision, convenience, and reliability.
My Buying Guides on 1 3 8 Drill Bit
What I Look for First
When I shop for a 1 3/8 drill bit, I start by checking the material I’ll be drilling into. I’ve found that the right bit for wood is not always the right choice for metal, concrete, or tile. I also pay close attention to the shank type, since I want it to fit my drill securely without slipping.
Bit Material
In my experience, the bit material makes a big difference in performance and durability. For general use, I usually consider:
- High-Speed Steel (HSS): Good for light to medium drilling jobs.
- Cobalt: Better when I need extra heat resistance for harder metals.
- Carbide-tipped: A strong option when I’m drilling tougher materials like masonry or tile.
- Brad-point or wood bits: Best when I’m working mainly with wood and want cleaner holes.
Shank Compatibility
I always make sure the shank matches my drill. A 1 3/8 drill bit can be large, so compatibility matters. I check whether I need:
- Round shank for standard drills
- Hex shank for better grip and less slipping
- Reduced shank if my drill chuck cannot hold the full diameter
What Material I’m Drilling
My choice depends heavily on the job:
- Wood: I prefer a wood-specific or spade-style bit if I want faster cutting.
- Metal: I look for HSS or cobalt bits for cleaner, longer-lasting results.
- Masonry: I choose a carbide-tipped or masonry-rated bit.
- Plastic: I use a sharp bit with controlled speed to avoid cracking.
Cutting Performance
I like bits that cut smoothly without forcing me to push too hard. A good 1 3/8 drill bit should remove material efficiently, stay centered, and leave a clean hole. If I’m drilling often, I prefer a bit that stays sharp longer and doesn’t overheat quickly.
Durability and Heat Resistance
For me, durability is important because a large bit can wear out fast if it’s low quality. I look for coatings or materials that help with heat resistance, especially when I’m drilling metal. If the bit overheats, I know it can dull faster and perform poorly.
Drill Power Requirements
I also check whether my drill has enough power for a 1 3/8 bit. Since this is a fairly large size, a weak drill can struggle. I make sure my drill has:
- Enough torque
- Proper speed control
- A secure chuck
If I’m using a hand drill, I avoid forcing the bit and let the tool do the work.
Safety and Control
When I use a large drill bit, I pay attention to safety. I wear eye protection, hold the drill firmly, and clamp the material when possible. I’ve learned that a large bit can bind if I rush, so I always drill at a steady pace.
Price vs. Quality
I don’t always buy the cheapest option. In my experience, a slightly better bit often lasts longer and performs more cleanly. I compare price with material quality, brand reputation, and how often I expect to use it. For occasional use, a mid-range bit is usually enough. For frequent projects, I prefer investing in a more durable one.
My Final Tip
If I’m choosing a 1 3/8 drill bit, I focus on the material I’m drilling, the bit’s construction, and whether my drill can handle it. When I match the bit to the job, I get cleaner holes, less frustration, and better results overall.
Final Thoughts
I’ve found that a 1 3 8 drill bit is a practical choice when I need a precise, reliable hole size for a specific project. My biggest takeaway is that using the right bit makes the work cleaner, faster, and much more accurate. Whether I’m working on wood, metal, or another material, choosing the proper drill bit always helps me get better results.
Author Profile
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Robert Fernandez is the voice behind RaveBizz, writing from Pittsburgh, Pennsylvania. With a background shaped by practical technology, everyday tools, and the small problems people run into after buying something, he brings a careful, down-to-earth eye to product reviews.
Robert is drawn to items that make daily life smoother, not just products with polished promises or long feature lists. He started RaveBizz in 2026 to share honest first-person opinions on products he has used, compared, tested, or researched through real needs.
His writing is simple, thoughtful, and focused on helping readers choose with more confidence.
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