BLUE BOAR 6-1/4" (159mm) MEGA Tungsten Carbide 2-1/4" deep hole saw

I needed a bit to put 24 holes in the hardie plank boards for recessed lights around the house. Not knowing much about good bits and bad ones, I bought this blindly. The bit worked great. 24 holes done and the paint is not even worn off. the teeth don't look worn or damaged. It went through the 1/4" hardie smoothly the holes looked great. A light sanding to smooth the edges and my lights fit beautifully. I was surprised my 18 volt drill did all the holes on one charge I carried 2 back up batteries in the attic anticipating a high drain. I learned its a two hand operation. One hand used to control the tool the other to slowly lower it down through the board. If you don't slowly lower it, it will take your wrist for a ride, if you don't use bits this size very often I suggest setting the clutch to keep the drill from catching too fast then spinning the drill around and hurting your wrist. I recommended this bit too a couple contractors whom since purchased and love there results, they used to do the draw, drill, and cut method. A Method I was able to avoid with this purchase.

The threads stripped on first use

The Blue Boar hole saw is awesome. I used a battery powered drill (Makita 18 volt) as recommended and have drilled a few dozen holes in I-joists for HVAC. The board that was drilled falls out of the saw most of the time instead of having to pry it out. The hole is quickly cut. They cost most but if I need more sometime this is what I will buy.

Great saw! Really rips through the material. Not for the inexperienced.

Very good quality hole saws and case, probably the best available.