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Availability:
In Stock.
Arrives
Thursday, Aug 27
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Size: 3/16" - 1-3/8"
Features
- FOUR SPIRAL FLUTE - Four cutting blades design guarantees a faster and smoother cutting. Feels like a hot knife through butter!
- TiAlN COATING - With 89HRC surface hardness, harder materials can be cut and higher cutting speeds can be achieved.
- M35 COBALT HSS STEP DRILL - Prefect for 1/8"(3mm) thick Stainless Steel/Metal Sheet/Wood/Plastic/Aluminum Sheet/Copper and other metal sheets.
- DIMENSION - Includes from 7/8" to 1-3/8". Popular Size 7/8", 1-1/8", 1-3/8" labeled.
- WARRANTY - If you are not fully satisfied for any reason, please contact us for 100% refund or replacement.
Description
#4 Step Drill Bit #1 Step Drill Bit drill bits for metal #3 Step Drill Bit #9 Step Drill Bit #12 Step Drill Bit Pro Max Step Bit Set
Material: Cobalt Steel
Cutting Diameter: 1-3/8 inches
Finish Type: Titanium Aluminum Nitride
Shank Type: 3-Flat
Cutting Angle String: 135 degrees
Brand Name: AugTouf
Model: AU0580004
Set Name: toolant Four Spiral Flute Cobalt Step Drill Bit Set (3/16" - 1-3/8")
Unit Count: 1 Count
Number of Packs: 1
Manufacturer: AugTouf
Part Number: 3/16" - 1-3/8"(19 Step Size)
Number of Pieces: 1
Included Components: 19 step 1-3/8" Four Flute Cobalt Step Drill Bit(1pc)
Warranty Description: 90 days warranty - free replacement or refund
Cutting Diameter: 1-3/8 inches
Item Dimensions: 3.14 x 1.49 x 1.49 inches
Minimum Bore Diameter: 0.19 inches
Material Type: Cobalt Steel
Finish Types: Titanium Aluminum Nitride
Shank Type: 3-Flat
Surface Recommendation: Aluminum,Stainless Steel,Wood,Copper,Plastic,Metal,Steel
Cutting Angle String: 135 degrees
Tool Flute Type: Four Spiral Flute
Point Style: Diamond Point
Number of Flutes: 4
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Aug 27
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 1/4" - 2-1/2"
This toolant Large Diameter Step Drill Bit (1/4"–2-1/2", TiAlN, M35 Cobalt HSS, 1/2" shank) is genuinely oversized and almost comically big when you first pull it out of the package, but it was precisely the size I needed for my project. The quality is outstanding — the M35 cobalt steel with TiAlN coating feels premium, the four spiral flutes cut cleanly, and the overall machining and finish are excellent. It performs very well on metal and sheet materials as intended. When I tested it in thicker wood (not its primary purpose), it still cut effectively, but you will want a drill with solid torque and control because of the large diameter and the amount of material being removed. Once you have the right power tool behind it, the bit handles the job smoothly. The packaging is also practical and protective, which is appreciated for a tool of this size and value. Overall, this is a high-quality, specialized bit that does exactly what it claims. I’m glad I bought it and would recommend it to anyone who specifically needs a large-diameter step drill of this caliber.
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Reviewed in the United States on August 14, 2026 by Carlos Garcia
Size: 1/8" - 1/2"
I am in the automotive electronics industry. I have used different types and brands of step bits for the last 20 years. Most of them turn to garbage after drilling through semi thick metal once or twice. And it ruins the tip. I have only used this new one on types of plastic and twice on sheet metal in the body of a vehicle. So far this bit works better than any I have ever used. It is so sharp you must be careful using it on plastic because it will cut a hole bigger than you want very quickly if you're not careful. I hope I have success in keeping it sharp using it on metal. Here's update on review. I have now used this bit drilling through multiple metal panels on automobiles. I have not had one issue with this product darling or causing me any problems. I don't know how it will do drilling through 8 inch solid steel but through body panels and floor panels on cars it does exceptionally well. . Here's an update from the middle of July 2023. This bit is really rugged. It will drill through 8 inch to quarter inch solid steel on a truck steak bed. I drilled the pilot hole with an 8 inch bit and used it to make the hole up to a 3/8. This bit is extremely Sharp and extremely brittle. I advise spraying silicone on it and keep your drill moving slowly watching it peel the metal. When you're going to that slow speed with this bit it works wonders. It's amazing. But I usually use it for thin metal in vehicles and it has no problem whatsoever. It gets seven Stars as far as I'm concerned. But be careful it is brutal when you are drilling big holes it can hang up and snap.
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Reviewed in the United States on December 23, 2022 by J. Trenthem
Size: 1/8" - 7/8" (3pcs Set)
These relatively inexpensive bits outperform very high dollar carbide machinist bits, and other much more expensive cobalt bits. The cut so fast that the material barely has any chance to get hot which makes them last forever. I've been using them not for several months and I am very sincerely impressed. It's really hard to trust sellers these days. I think I paid 60 bucks to try them in my body shop just as a chance they might work on the lighter sheet metal and they performed so well and lasted so long I have started using them in my machine shop. They are suitable for cutting harder than mild steel, alloys and stainless with no issue whatsoever. I cannot speak highly enough of how surprised and utterly impressed I am with the performance. The most surprising part is the cost! They are the cheapest bits I own and they are also the best drill bits I own! I'm putting together a list to start replacing my professional machinist quality drill bits with these as they go bad and dull. They cost less than sharpening my bits and I have yet to dull any of these as of yet. Very surprised, impressed, and happy with them! I wish more things were like this. I'm happy I took a chance and bought these taking a low risk chance that had really taught me a wonderful lesson.
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Reviewed in the United States on September 12, 2024 by Chisty Rich
Size: 1/8" - 7/8" (3pcs Set)
Purchased 3 years ago, the unibits I have owned. Aggressive and maintain sharpness except for the pilot tip that dulls quickly. I work around this by predrilling a small hole with a regular drill bit first. Note I recently broke one where the shaft gave up on a non-impact drill A 1/2" shaft would be better, makes me wonder how these are "impact rated". I will be replacing the broken one with the same brand.
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Reviewed in the United States on March 1, 2026 by Gern
Size: 1/4" - 2-1/2"
I have not needed to use a step drill before, but I cound myslef needing a larger hold for an rv trailer jack, and was contemplating fabricating something to enable me to enlarge the hole. This unit popped up in a general search, and wow was I happy to find out t was large enough for my need. It was ~65 usd, and it was worth every penny. It is well made, and did exactly what was needed. No drama, fighting, surprised - just a larger hole in about 20 seconds - going slow so as to not mess up the hole. Super happy
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Reviewed in the United States on June 9, 2026 by Stephen F. Abbot
Size: 1/8" - 1/2"
I have 1/8" 304 Stainless bar I needed to drill through and this thing barely made a dent, even though it's promoted for that use. Used Tap Magic ProTap Cutting Fluid and low speed on my drill. Picked up another, more affordable option and it did the trick. Pretty disappointed with this one.
Reviewed in the United States on July 23, 2026 by TX Chuck
Size: 1/4" - 3/4"
Excellent Quality! Way better than the so-called titanium coated ones from H-Freight. Cut through metal with ease.
Reviewed in the United States on August 20, 2026 by BaloSurf
Size: 1/4" - 2-1/2"
I was installing a smart lock on a business door and the hole for the deadbolt was not large enough. The door was steel and wood. I did not need to go all the way through, just enlarge the outside to 2 1/8. This drill bit was perfect for the job.
Reviewed in the United States on July 21, 2026 by Retired Twice