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)

Used on 1 1/2” floor joist had to auger out pilot hole 3/8” to get the depth

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

Gave to someone

Only used it once so far, to cut through the roof, but it is heavy duty, cuts well and easy to use.

Is easy to use does a great job. Thanks.

I broke my arbor and bought it with the hole saw. Great deal!

This did exactly what I needed it to do. I would rate it for 15 or so holes through plywood sheet metal etc. Came with extra centering drill bits and Allen wrenches. If youre not doing this professionally and repeatedly this is all you need.

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.

Good value, came with spindle and an extra center bit which is really nice. Seemed to clog a little faster then some of the name brand hole saws I have in my collection but did an adequate job of cutting. Didnt cut all the way through so unsure of how hard it is to remove the cut out piece only has small slots for that purpose. All in all excellent price and fast delivery.

At a large hardware store this will cost you over $30. Here it was a fraction of the cost without compromising the quality. I was installing a laundry exhaust and had to cut through aluminum siding asphalt siding and plywood for a total of 3 inch thickness wall. I did have to do it in increments because of the depth of the hole saw but that is to be expected.