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

Threads on saw/bit failed on first use. Junk!

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

No problems easy set up and use

Very dull. Threads need to be reversed so the arbor doesnt go spinning off. Just made it through 1 hole in 1 press board. Would buy again.

It didnt cut my test piece of wood. Also didnt fit my corded drill, I had to borrow a cordless drill. Why the chuck was slightly bigger on the cordless drill than corded drill, I dont know.

Needed to cut one hole in my soffit foot an exhaust fan. Did the job, though if I needed to cut more holes I’d buy something of better quality.

Using to drill LP records..

Broke on first use , not much else to say

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.

I have no complaints I used it to cut over a dozen hole in 1in thick hardwood for a project. Works great