JIECHENG Bi-Metal 4 inch Hole Saw with Arbor Mandrel for Cutting Wood,Cornhole Boards,Drywall,Plasterboard,Plywood,Steel,Aluminium,Brass,Copper,Zinc,Tin,102mm

Worked fine for project

Adequate for my limited use boring thru fiberglass bulkheads for installing vents.

There are a lot of review that say the blade dulled after one cut, or the threads stripped, etc. I had none of those issues. I bought this to drill holes in my RV floor, which is 3/4 plywood. Four successful holes later, its still pretty sharp and totally usable for future projects. You do have to watch when you stop the drill that if the saw is in free space, inertia will keep it spinning and it will unscrew from the arbor. After I cut a few holes, it was firmly screwed down to where I cant even unscrew it anymore, so the unscrewing was a temporary problem for me. I guess because I was expecting something unusable, I am really pleased with how it worked. Not for cutting metal for sure, but if you just want a few holes in plywood or sheetrock, this is a great cheap alternative.

Used it to make a feral cat house. Cut right through a double sided cooler & didn’t leave rough sides to the cut.

Used it to make a feral cat house. Cut right through a double sided cooler & didn’t leave rough sides to the cut.

Well it makes holes

wouldnt cut through a thin sheet of metal

... or maybe a bit less. Being the cheapest 4 hole saw on Amazon, it clearly doesnt aim for quality, but it got my job done. Which was a neat and tidy 4 hole in my ceiling. It wobbled a bit; no big deal. And the arbor has no securing mechanism, neither locknut nor pins, so if you take your finger off the trigger suddenly to stop it, the saw flies off the arbor into hopefully vacant space. My advice is to screw it on as tightly as possible and slow the drill gradually.

Tends to lock up a bit and the drill will detach unless you really tighten it. Overall got the job done.

Great price and very good quality. Cuts rapidly through 3/4 material. With proper care should last a long time.