Mollom Heavy Duty Carbide Hole Saw, Hole Cutter cuts Stainless Steel, mild Steel, Iron, Copper, Brass, Plastic (3 76mm)

Used it to cut a 3” hole in a 550 gallon stainless steel tank. It cut through it faster than my drill could handle. I will be buying more of these. Just wish they were made in USA

As the title states, the feeder bit broke on the very 1st hole. It was only a typical metal stud and nothing thick at all. It broke immediately as it penetrated. Im a plumber and tend to use a hole saw for my holes but after trying out a similar kit to what this bit is, figured it would work great. It didnt work at all. Returning for refund and I will not bother to try again. Time is money and this feeder bit (also called the guide bit) is far to cheap to work as such a bit would require.

Bought the 180mm (7.x) hole saw to drill a hole in a 250 gal propane tank, my smoker project. It cut it, still has its teeth and I presume would be able to cut more. I figured it was a 1 and done use but if I ever need to use it again it might have some life left in it. Worked out perfectly for the 7 pipe Im using for the stack.

Bought two, and both drill oversized. One drills 0.20 oversized and the second drills 0.30 oversized. If you are drilling say a bolt hole, it’s a really sloppy fit. The quality of build was fine, but the accuracy wasn’t.

So i wondered why they give you two guide drills (that go in the center of the hole saw and guide it straight as you drill/cut because without it the hole saw would wander all over the place). Well mine broke the first guide drill within a second of starting the hole. And that was with minimum pressure as I am always cautious to start and add load slowly. The second drill bit went just as fast. I put a dewalt drill bit in there and that did not break so.... needs work I would say. After getting far enough for the hole saw to engage with the aluminum (1/4 inch, fairly soft Al plate) it chattered and tried to wander but the dewalt bit held. Still it didnt cut straight and instead gouged out an elliptical hole. Slowly. With a tremendous amount of noise. Now as you machinists know, aluminum has a high cutting speed and both steel and carbide bits will cut it cleanly but I hesitated to ramp up the speed much more as I didnt trust this bit not to come apart. Maybe I can save it for use on wood. I definitely would not recommend this hole saw for even soft metals like aluminum and brass. If I had an end mill this large i would have used that instead. So, maybe good for wood, not anything harder and the guide drills are not to be relied upon. Update: Seller has offered a refund but thats not important to me. I did take the bit to a friends machine shop and we put it in a 3 jaw chuck on a milling machine for the hell of it and fed it by hand and it did cut aluminum plate ( no guide drill required) without visible damage to the carbide cutting bits so I guess this qualifies redemption of sorts. When it cant wander it does cut so keep that in mind.

I used this to drill a hole in my bumper for a block heater. I thought it would take two due to quality, so I bought two of these. Turns out it is of great quality. I will use this for years

Pilot bit broke halfway through the single hole I needed to drill in my new stainless steel sink. Couldn’t find a perfect size replacement bit at local home store, so hole ended up wobbling and being wallowed out. Luckily what I was putting in (glass rinser) covered the oversized hole.

Great tool for drilling hole in shipping containers to install vents. Go slow at a angle, with coolant, cause that corton steel is hard. This hole saw stands up to the test.

Came in short wait time was excellent for cutting 16guage metal cut clean was very useful thank you

Cut the size I needed and hardly looks used.