ABuff 4 inch 100 mm Hole Saw with Arbor, Heavy Duty 38mm Depth Bi-Metal HSS 4 Inch Hole Saw Blade with Positive Rake Teeth for Cutting Soft Metal, Drywall, Plastic, Wood, Fiberboard

I have used this type of hole saws for many years with varying success. This one did a GREAT job on the project that I was working on. I needed two holes cut, but a chest freezer is insulated and so 4 pieces of metal had to be cut and this saw went through the metal on the outside then through the insulation, and out the other metal side with ease. There was also copper tubing hidden in the insulation on both holes. This saw cut through all of this and the teeth remained sharp as new when the job was finished. ( I'm making a fish smoker. The Reds are starting their run up the Kenai River here in Alaska)

Very good

It’s a hole saw…. It works, decent quality.

Works well with a half inch drill. I used it for a new dryer vent location.

This hole saw made installing a few dozen 4” recessed ceiling lights a breeze. I also used it to punch a hole for 4” round junction boxes. Those were done through 1/2” drywall. At first the holes were a little jagged because the drywall crumbled but I think that was my fault being cautious and taking it slow. When I went full-speed beast mode it punched through clean and precise. My husband used it on a 4” duct for the dryer vent going through 3/4” Zipboard exterior sheathing - clean hole, perfection. No complaints here!

Very sturdy. Well worth the money. Excellent value.

Very solid assembly. The Mandrel is solid - but do consider that you need 1/2" chuck, I luckily had several drills around but my first try was on a smaller 3/8" and it didn't fit but that's on me. The hole saw is solid. It does come with a wrench and spare center drills - very helpful. Dimensions wise the manufacturer is on the money - good 4" hole and with the teeth alignment as-is the final product is just a tad over 4" which is exactly as it is supposed to be for 4" conduits. Great product. Thank you

The product is good quality and comes with multiple bits, however if you want to use it to cut sheet metal holes for HVAC holes this is not a good hole saw to use. Basically the bit just keeps enlarging the pilot hole and the saw itself just mars the surface. Ended up using a jigsaw following the mar the hole saw made. I suspect the teeth are too large.