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Availability:
In Stock.
Arrives
Tuesday, Oct 20
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
Item Highlight: M35 Cobalt HSS; TiAlN Coating; Four Spiral Flutes; 1/4" Hex Shank Unibit; Metal/Stainless/Aluminum/Plastic
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:
Tuesday, Oct 20
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: 1/4" - 1-1/8"
Far exceeded my expectations considering it's price point. I used it to bore fourteen 1-1/8" holes through 11 gauge steel and it produced very clean and true results (see my photos for reference). Run it on a drill press, low RPM, with sufficient oil and only gentle pressure. A light press/release/repeat rythym. Good tool, good price, good purchase!
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Reviewed in the United States on September 9, 2026 by S in TX
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"
Very nice tool. It was very sharp. Worked like butter.
Reviewed in the United States on October 1, 2026 by Coy H.
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" - 1/2"
Broke two bits trying drill thru a golf cart spindle. This sob went thru it like butter! Definitely will have this brand in my cart.
Reviewed in the United States on August 28, 2026 by NessaCordes2018
Size: 3/16" - 1-3/8"
The first one I bought lasted through 1.5 holes before going dull. I figured maybe it was a fluke and ordered a replacement which lasted me 3 holes before going dull. Mind you, I'm only drilling through 3/16" steel and using a lubricant. Having seen all the positive reviews I'm thinking maybe it wasn't designed for anything heavy duty. I'm not sure if its because I'm drilling through structural steel or not but being that these bits are supposed to be cobalt and the fact that I have a smaller step bit that I've been using for over a year now which drills through everything like it's a piece of candy, I have to say this toolant bit is no good for me. I do however like the design, it has a lot of steps for alot of different sized holes and it looks cool but I think that having a lot of small steps makes the cutting teeth smaller as well and unsuitable for anything harder than mild steel. Either way, for the price it's not worth it Imo.
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Reviewed in the United States on February 21, 2026 by Headache