Best hole saw for plaster and lathe. I have 3" that I use for mini splits and I need 4 1/8" for LED panels. Can't say enough good things about Starrett Carbide Bits. I just cut out 45 4 1/8" holes for the LEDs in the plaster. The saw worked great, no problems. I didn't buy it to cut firewood so didn't penalize it with a stellar decrease.)