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

Just an fyi need a 1/2 chuck to get this to work. 12v tools dont fit.

Didnt use this item, as the arbor is way off and would have resulted in a very messy and oversized cut.

Perfect

This will not fit either of my black and decker 3/8 drills. I contacted the company and this is their response: Hello ，thank you for your feedback, we dont find your video or picture , but i send you some pictures in attachment of the 3/8 arbor, you can see we measure the distance between two sides, please note it is two sides not two corners. this is the customary standard in the hardware tool industry. another question is to see if your chuck of electric hand drills is marked 3/8, sometimes the chuck is not standard too. so there are many reasons for this. in fact we are company in China, no branch in USA, so we cant send you another pcs for test. but if youd like to buy this stronger arbor, maybe can be better, but not sure if it fit your chuck, the link is : https://www.amazon.com/dp/B081VQQQT4?ref=myi_title_dp . and another way is that if can not use it, please return this item to amazon. sorry for it. and hope you have a nice day! regards Jack The three pictures showing the measurements are the pictures mentioned in the response. The key point is the measurement of the arbor is not point to point, its side to side. It might fit most 3/8 chucks but not all. Good luck.

Center drill broke immediately upon use. Good thing I had spare center drill from a Milwaukee smaller hole saw kit.

The yellow hole saw stripped in the mandrel in the first day of using. Metal too thin. Of no use to me after a hole or two cut.

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.

Lasted about 5 minutes

arbor threading was not tapped square. so when drilling the whole saw wobbles and is unusable. horrible construction