TEMO M35 Cobalt Step Drill Spiral Flute, 6 Size from 3/16 inch (4.8mm) to 1/2 inch (12.7mm), 1/4 inch (6.4mm) Hex Shank gc

Very good , have been using on stainless steel

Went through some 3mm 304 Stainless easily - seems like a very high quality bit to me - recommended

Brilliant don't know what I would do without it

The step drill is high quality. I drilled seven holes in an electrical panel, and it was very good. No sign of wear... The punch is junk.... Overall, I am good, as the main tool here works, and works well...

I bought this to drill holes in my 18 gauge (305?) stainless steel brew pots. I used liberal amounts of cutting oil and this bit went through the SS pretty easily. Nice clean hole.

Good quality. Nice and sharp. Drills well and clean hole

Pour percer le métal

Good tool

Utilisé pour agrandir un trou dans une plaque de plastique. Permet un travail propre et progressif.

pas pour l'inox

I bought this after reading a lot about how step-bits work. Turns out most of the cheap ones won't drill through stainless. The basic principle is obvious: to drill through any material, the bit needs to be made of a harder material. Its why diamonds are used commonly for cutting applications. Its the hardest material available.For step bits, (and other metal drilling bits) the best material is cobalt. However, the cheap ones won't last, because they either don't have cobalt in them, or they just coat them in a thin layer of cobalt. So be wary of tricky advertising.I found this TEMO that had great reviews and after reading about it, turns out its made completely out of cobalt. AND it was not as expensive as other brands. I was skeptical because i had read that to get a cobalt one, you would have to spend 50 bucks or more.This baby cost about 20 bucks and I have to say, it went through my 18 gauge stainless steel kitchen sink like butter. Here's how we went about it:Other materials/tools needed:Center Punch : Starrett 117C Center PunchCutting Oil: CRC 03400 16oz Truetap Cutting Fluid0- Of course, measure twice, drill once to ensure the hole is in the place you want.1- Use a center punch and hammer. Pound it until a small divot is seen on the sink. Dont be afraid to pound with force. Just be careful with your hands :) The divot is necessary to steady the bit in place.2- Mark the step that you want to reach with a permanent marker. It will be easier to see where you are at. Pour 2 - 3 drops of cutting oil (I used CRC 03400 Truetap Cutting Fluid Heavy) on the divot. Also pour 1 - 2 drops on the tip of the step-bit. Let the bit be covered by the extra oil. You can smear it with your finger.3- Drill on the lowest setting. NO HAMMER ACTION. Start slow.4- You will see that the bit starts chewing on the metal. If the bit starts to smoke, STOP. If you see too much metal debris, STOP. Clean the bit, clean the area. Dip the bit in water to cool it (won't damage the bit at all). Dry the bit and re-apply oil to it. Repply oil to the clean area. Cleaning the area is necessary to avoid unnecessary friction and heat. Makes the job end up nicer.5- Continue. You may increase speed once the bit is steady. Keep an eye for the smoke and cool the bit if necessary.6- Once the tip of the bit is completely thru the metal, it becomes very easy. Don't apply too much force. Its better to go slow than to drill a hole thats too big. You can't get back from that.7- Enjoy!The bit made a very clean hole, no sanding necessary. The bit also showed no signs of wear and tear.The time it took to drill the hole was about 5 minutes.

Boy oh boy am I glad I bought this step bit over the cheaper ones I was considering. I needed to cut a bunch of different sized holes in a 1/4-inch-thick piece of hard aluminum, which I'm using on a home-built router table. I initially looked at other cheaper unibits that claimed to be made of cobalt or titanium, but I learned long ago that you can't go cheap when it comes to tools. You always get what you pay for, especially when it comes to tools. But this bit cost five times that of the cheaper ones, so it was not an easy decision.This bit arrived on time and came in a nice plastic storage case. It was well-oiled and quite sharp. Its quality is noticed the moment you pick it up and feel its solid weight.Drilling the holes was like using a hot knife through butter. Using the "1" speed on my power drill, I was able to completely bore through the aluminum within about a minute or two. The bit remained cold to the touch immediately after drilling several holes.The flutes/blades still remain very sharp with no signs of chipping or marring. Do not waste your time and money with the bargain bits. Get this one and use it for a lifetime.

While the part number online matched the packaging, the product was not as pictured or described. Instead of having a 1/4" hex shank with a milled collar for use as a 1/4" hex bit, it was a round shank ground flat on 3 sides. I wasted $17 on an adapter due to this product not being what it was supposed to be. I'm giving it 2 stars only because the product quality appeared to be good, even though this transaction was an overall waste of time. It is very frustrating to plan out work and then end up further on hold due to the wrong parts and tools. Additionally, I had to pay UPS for packaging to return it. I wish I had taken a picture for you guys before I sent it back. I don't think I will risk buying a TEMO product ever again. I don't typically write reviews, but these guys earned it...

Needed to drill four holes through an i-beam to mount a pull-up bar. Regular cobalt drill bits barely made a dent. After reading the reviews, I decided to try this TEMO M35. Ok - not really like a hot knife through butter. More like ten minutes of sweaty torture on top of a ladder. But it got through over 1/2" of steel and didn't show any signs of slowing down on the fourth and final hole. I, of course, slowed down a lot.Use lots of oil and slow drill speed to keep the bit cool. I was drilling up into the i-beam, so I used a qtip to dab oil into the hole about every 15 seconds. The bit never got hot, although some of the shavings certainly did. Highly recommended.

Good sharp bit! We had to ream out a batch of laser cut 3mm stainless, 18-8, and dropped the drill speed way down (500 is the lowest it will go on this press) and used a moderate amount of cutting oil applied between each part change (2 holes) Cut perfect, no stalling, minimal heat buildup.If you are having trouble cutting stainless, slow the drill down. You want uniform chips. If you are not getting small curls, and a lot of smoke, get the 500lb gorilla off the drill and apply some finesse.Quality bit, will buy this brand again.

I’m not particularly knowledgeable on machining or drilling metals. But I bought this tool to make 11/16” holes in dozens and dozens of pieces of 1/8” decent quality steel. I made a small pilot in each piece with a drill bit, then switched tools to this step drill and pressed right through to the 11/16” hole size. It cut smoothly in one piece after another. After I was done maybe 60-70 holes later, it was still as sharp as the first piece. Maybe that’s expected, maybe it’s not. I don’t know. My cheap drill bits generally don’t fare as well though.The tool did leave a large burr on the backside of the hole. I found a way to back off at the last second that would sometimes eliminate the burr, but that was only successful half the time.It came in a simple little plastic case. Nothing fancy, but nice enough to keep it from rattling around my tool box and getting lost.

I needed to put new holes in a 16 gauge utility stainless sink.I bought a puch, drilled two starte holes with high carbon drill bits. Increased the hole to 1/2 inch than used this spiral flute.Using cutting oil, this M35 carbon drill increased the size to 1 1/8 inch without a problem.Sharp and easy to use.Worked great for the 16 gauge sink.

I bought this step bit after going through many name-brand cobalt regular drill bits. It’s been a reliable workhorse for drilling through mild steel. I’ve even done a few holes in automotive boron steel, using an old porter cable hand drill. Granted, step bits are supposed to last longer, but this drill has well outlasted any of my other name brand cobalt bits and has shown no signs of slowing down. Highly recommended, especially for the money.