Bought the 1.25 inch hole saw to cut a hole in a 16 Gauge Stainless Steel sink ( ≈1/6 in. or ≈ 1.6 mm ) . Took under 15 seconds and produced a clean cut and no visible damage to the cutting heads. I previously tried with a step drill bit for another hole and it was a disaster with it taking forever and a shred drill bit at the end. Not sure of the longevity but it served my need as it was one time use.Well worth your money cut 27 holes and don't even look like I used itGood enough for the pricesturdyExcellent tool for cutting stainless steel sinkOnly had for a few days. So far they work goodBased on other reviews I purchased this EZARC Tungsten Carbide Teeth Hole Saw (Hole Cutter) Heavy Duty for Stainless Steel 2-1/8'' 54mm size to cut 4 holes in each of two 55 gallon steel drum to make two burn barrels. It was still sharp on the 8th hole and cut perfectly round holes in each of the 8 holes. Thought the price was a bit high, but it work very well. The hole cutter started to smoke on the 4th hole, so I applied oil and filed each of the previously cut holes to let the bit cool. On the remaining holes, I filed the hole after cutting to let the bit cool and I still got some smoking, but it was minimal. Would recommend this hole cutter for anyone looking to cut holes in steel.I liked it so I oedered 2 more for comworkersOh, WHY didn't I find these long before now!I install cooling systems, and I work on many sites where I need to cut holes in metal - sometimes thick and sodding hard metal. Shipping Containers are a prime example.I've spent many 100s of pounds in 10 years on those standard hole cutters - the Bosch ones being the best I could find, but would still only last a couple of cuts then start giving up, and often new cutters would dull before completing the cut. On many occasions, I was having to reach for a drill to drill many small holes for the hole cutter to take, an angle grinder to finish the job or to cut a rough squarish holeAnd then I happened across this "Tungsten Carbide Teeth Hole Saw" - never seen one in action or on-site so was sceptical it would be effective. I was also wary that it looked like something that was best suited on a bench drill, whereas I will be using on a cordless drill on-site. It is not cheap, but I was desperate so took a puntAnd then I used it... WOW! A quick, clean hole - like a very sharp knife through melted butter! What have I been missing for all these years! I'm not talking silly thin metal - this is the same for thick stainless steel - and it has yet to blunt the jaws. It's not even worth trying to compare to the other standard hole saws - this is in a league of its own.It was one of those times of enlightenment - the first time I used this I was full of bad memories of years gone past with a spinning hole cutter doing nothing other than making a nice circle and no hole... many broken bits where you try and twist the cutter to "take"... thousands of small holes and cutting between using a chisel. I almost cried, folks...Now been used on many occasions far outlasting any other hole saw I ever had the displeasure of using, so despite the high cost this is both a money saver and a time saver.The only niggle is that the hole cutters have a depth stop which can be a pain when I'm drilling in panels with a cavity. I suspect this is because it is (as noted) purposed for a bench drill and not for the purpose I am using it for. No worries as I can alternate between a slightly larger hole cutter then a smaller hole to reach the second stageA word of warning - this produces swarf and a lot of it. Wear glove and a protecting face mask or you will regret it! I would also recommend a cutting spray, as that also helps it slide through the metal, although I have found it not to be essential, but like to look after the bitIf anyone regularly cuts through metal, then I would strongly suggest you dip in your pockets and buy this cutterFor those who wrote reviews saying that it didn't last more than few holes I say, shut up, you don't know how to use tools properly.As I've gone through 60 so far, 60 30mm diameter holes in 3mm stainless steel, and now the best part-with no cutting oil as I hate to cleaning it of before welding. The best hole cutter I've ever used. Slow, perpendicular to the work piece, do not over heat and that's it.After recently spending 3 hours to drill a hole in a stainless steel brew kettle using a stepped drill bit advertised as being suitable for stainless I had decided not to attempt such a task again until I saw other reviews for this product and thought I'd give it a go as I still needed more fittings on the same kettle.I was hoping the 3 hours might reduce to 30 minutes or so but** WOW ** once it hit the large outer diameter ring I was prepared for the hard work but it actually cut faster, popping through and ejecting the 21mm disc from a neat hole in literally seconds.A truly astonishing experienceThe pilot drill in the centre is not bad but still cuts very slowly so I have now ordered a set of carbide tipped drill bits.Overall extremely happy with the productI have now had 2 of these and both bits broke on the first hole. With the first one I persevered with the cutting tool by drilling a 6mm hole first then used the to cut the 25mm. The tool only managed to cut around 40 hole when some of the teeth can off. With all of these types of tools it's important to give the benefit of doubt and try a couple before giving a review. So my final thoughts would be that this tool is over priced compared to the similar Starrett (£12) product and the bits of terrible so I will be returning the 2nd one and buy a Starrett one instead.Not very happy with these! The first hole was brilliant but while drilling a second hole, the bit snapped and I was left with a useless hole cutter. I was only cutting through 3mm stainless panel, not like it was heavy duty or anything.I had to order a new bit, at my cost, in order to be able to use the hole saw again.