Koopi 4.25 Hole Saw with Heavy Duty Arbor, 38mm Depth Bi-Metal 4 1/4 inch Hole Cutter for Easily Drilling Wood, Plastic, Plywood, Drywall, Thin Metal (108mm)

I was tall was as described I recommend using your drill and reverse when sawing sheetrock

Ordered this hole saw to install ceiling cans. It works great on the first three. After that It dulled quickly.

Is easy to use does a great job. Thanks.

This product came disassembled, with no instructions in the box. Ive been in construction for forty years, and Ive used lots of tools with arbors. But this arbor was a new one on me. I tried for a half-hour to figure out how to put it together. Finally had to go to computer and take a close look at the item on the Amazon page. Also, be aware assembly will probably require use of a pair of split-ring pliers. Once assembled, it did a good job cutting through 1 pine siding and 1/2 flakeboard sheathing using only a P-C cordless drill. Be aware, though, that advertised 1 1/2 cutting depth is shall we say optimistic. Id say 1 1/4 is more like it. For example, I dont think you could cut a hole through a 2x4 without coming at it from both sides.

Its not crazy high quality, but if youre a DIYer putting in some wafer lights, it will do the job without falling apart. Pro tip: run it in reverse to keep your drywall cuts clean and dont push too hard.

This little saw cut 8 holes through Hardy Soffit and I beleave it remains sharp enough to cut 8 more

everything

I bought this to drill 6 holes in my ceiling to install LED lights. It is a custom home from the early 70s, so the ceiling drywall has about an 1/8-3/16 of plaster finish. By the third hole, the teeth were 75% gone and it would not cut. I had to cut the remaining three holes with a key hole saw - that saw had no problem at all cutting the plaster-coated drywall. Im sure the plaster layer is more abrasive than plain drywall, but this bit is supposed to be able to cut through metal. I cant imagine this bit would hold up for very long in anything other than plain drywall. If thats how it was advertised, Id be fine with the outcome, but they represent this as a cuts anything bit, and that is very far from reality.

This worked well for cutting out holes for my can lights. The hole saw is much heavier than I thought and the the peg holes on the side are very much needed to keep the center from slipping/stripping while you drill. Some other brands offer a spring on the bit to kick out your wasted center but at least for my drywall, this wasnt an issue. I could see this being a slight pain with wood but not a deal breaker. A few downsides however is that when you thread your drill bit assembly, there is still 1/16 or so that you could tighten to get it to seat completely BUT then the side pegs wouldnt be able to seat in their respective holes so youre left with backing it off a bit. One thing I was not expecting that you should be aware of when cutting something more heavy duty like wood is that due to its weight, this thing will act like a car flywheel and have enough inertia to kick out your drill so I definitely recommend double hand holding your drill or better yet, using one with a side thread handle.

This hole saw worked great for installing some recessed lighting, however I’d be concerned about the longevity of this product solely due to the fact that I only installed 4 and a few teeth were getting dull (ONLY from drilling through sheet rock/drywall). I’m sure for the average consumer wanting to use it as a one time or very seldom tool in order to install recessed lighting, it’ll be great however if you’re in a trade where you perform this type of work quite often I would look to invest in a name brand hole saw.