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

the bit is not sharp it took an entire day to cut 1/16 plastic about half way through then we used a hammer to try and pop the bit out because it was stuck the the bit split into two pieces

Doesn’t work... do not buy

Couldnt even get through 1 piece of 20 gauge sheet metal.

I am not sure if this thing is good or not because I cannot tighten the arbor with the provided allen wrench. When trying to use the hole saw came flying out and could have hurt me badly. So dangerous! If defected on one might be defected on others too.

I purchased this saw for my outdoor recessed lighting project and the saw would not cut through my soffit. Had to use additional saws and drills. Complete waste of money and time.

Do not waste your time buying this. I bought to drill a hole in a new gas tank. It would not even cut through the tank before dulling. I had to go buy a better quality one to finish the job.

the threads spun out of saw first use. I used the included arbor and it stripped the threads out of the saw on the first use. Most arbors for hole saws of this sixe use a arbor with pins to keep the blade from twisting on the threads but this one did not, so get what you pay for I guess.

Wanted to make quick holes on the cealing for recessed lights. Cuts thru drywall like butter. Cant ask for more.

Ive only used it once. Well see how it holds up but for the price it served my needs. And beats having a repairman come out

The hole saw is not exactly the 4 inches I needed to put in a exhaust duct on my roof I was able to use the same holesaw and Waller out the hole. For the value it’s not bad you’re just not gonna have a perfectly outside diameter 4 inch hole you’re going to have to work for it. It’s a Chinese tool... I mean lol