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COBALT HSS STEP DRILL BIT SET
MEET THE NEEDS OF COMMON SIZES
C A
Reviewed in the United States on March 13, 2025
My new favorite drill. I've been a fan of step drills for a while, but one this small is actually quite useful around the shop. It cuts fast and seems to be made of good quality steel. I'll probably purchase other sizes from the vendor I'm that pleased. Mine was free, but I think it's a great value for what it is.
Tom Xavier
Reviewed in the United States on March 11, 2025
The Thinkwork M35 is a useful step drill which can open up holes from 1/4 to 3/4 inches. The range of sizes is not that big, but it does give you the ability to size your hole accurately within that range. You can use it in either a hand drill or a drill press and it makes opening a hole easier than going through different drills in a set.
DBM
Reviewed in the United States on February 9, 2025
Having debris removal is vital for a smooth, accurate, and uneventful cut. This is not to say that a sharp bit is not important as well. This step bit has a dual spiral with enough space to carry out debris. Straight flutes have been less effective for me, especially if there is only one - which is especially problematic for shavings of metal that are longer. Having two sections that cut creates a shorter shaving that is more likely to travel out easier, and when coupled with a spiral design will leverage friction to carry it up and outward. Lastly, having two flutes balances out the pressure and has a more balanced feel when cutting.This bit has all of the above advantages. The only thing that may be a slight issue is ensuring that your cut is to the proper diameter since the bit is rather short and does not allow you a larger view of the steps that some other bits have. None the less, I use a marker of a contrasting color to show where I want to stop, coloring the step that I do not want to cut through. If I need to remove the marker, I use rubbing alcohol and spray the bit with a little oil to prevent corrosion when it is being stored. Speaking of being stored --- I love that it came with a resilient case. Storing it without being impacted by other tools that can damage the edges can sometimes be a challenge, but no longer is the case with this protective cover.I have no issue recommending this bit, but with the following caution: You need to have a little skill in controlling the cutting so that you stop where you need to (since if you remove too much metal, you can't put it back - making the process rather unforgiving). If you think that you will have a problem, for making large holes in sheet metal, there are always dies that you can get that will make only one size hole. If you need to make different sizes, you will need to carry multiple dies - which is the wonderful advantage of a step bit: You only need to carry one bit for a range of sizes, or perhaps a couple to have a wider range of sizes.
KTM
Reviewed in the United States on February 6, 2025
Never saw the value in these step bits until I tried drilling thin aluminum and messed up the piece badly.Yes you can drill thin stock if you can firmly place a 2x board or 3/4" plywood piece under it for support and so the std. drill bit cuts smoothly, but that's not always possible and that's where these bits shine.This bit cuts clean and comes in a protected tube (was a bit difficult getting it off its holding block though).A nice addition to your bit collection. It's always nice to have the right tool on hand when needed.
Charlie C.
Reviewed in the United States on February 3, 2025
When these step-drill bits first came out I thought they were another gimmick so I never invested in one. But I've seen some videos where they have been used and became intrigued. This one is well machined and looks to be a quality item - not just some sand-casted junk. I tested it on a polypropylene yogurt lid and on some thin aluminum flashing - two items that I have never been able to drill cleanly with conventional bits. I first tried a hand-held electric drill - I had trouble controlling the depth, it just pulled through to the largest diameter, but it was a 'clean' hole. So I moved it to my drill press and supported the thin material over the center hole in the drill press platform. Here I was able to control the depth and got a series of very nice holes. The 7 holes in the aluminum are: 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, and 5/8 inch. I'm impressed and am glad to have this in my kit! I will be looking for a larger size to complete the kit!
AUSS Customer Service
Reviewed in the United States on February 14, 2025
Smooth clean cutting! Fair price for a extremely well-made bit!
Yral Cenacsel
Reviewed in the United States on January 9, 2025
My first reaction to seeing this bit was surprise at its small size. Compared to other similar priced step bits (see picture) it is very small. The steps measure less than 1/8 inch (.125 in), and I mic'd them at around 0.10 inches. I don't know what material other than very thin sheet metal you would use this bit for. Drilling through thicker material means you would be into the next larger steps, giving you a tapered or chamfered hole. The package states the bits are designed for metal and wood. This type of bit is hard to sharpen and I consider them disposable. You can buy a complete set of 4 bits with varying steps and diameters for the price of this bit. Picture shows bit of far left with a set of three that was purchased for the price of this bit. As far as performance, the bit does cut like any other HSS bit.
Steve
Reviewed in the United States on January 27, 2025
This is a smaller step bit so it's pretty compact, which I like, even though it's small it can make up to a 5/8" hole. The one issue I had making some tet holes in thin galvanized steel was trying to control the steps, it was pretty aggressive so a couple of times it caught and jumped a couple steps past what I was trying to hit. I was just doing test holes, so I wasn't being real careful, but it would be something I'd be worrying about in a real project, though I'm pretty sure as long as I was worrying about it and being careful that it would work okay. I'd just prefer a little less aggression at first with a tool like this so the next step started out just deburring If I hadn't worked at it a little first. Overall it's a nice versatile tool, it should be a nice one to keep in with my driver bits so I have a drill bit on hand if I need it, the 1/4" hex shank means I could even load it up in an electric screwdriver in a pinch.
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