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

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.

I havent used it yet but he the way the drill bit attaches to the saw is really a cluster. Could be much simpler

Pretty Cheap but works well. I use it on PVC. I would not suggest it for Metal

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.

The arbor doesnt come close to fitting the hole saw. None of the arbors I already have fit it either.

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.

Value and precise size of finished hole.

Bought to install ceiling recessed lights. Definitely a great value. Only used on drywall but had no problems cutting

I got this to install these: https://www.amazon.com/gp/product/B087JL1W9M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 It is perfect!

No problems easy set up and use