Well it did what I needed, cut a 1 3/8 inch hole in my sink for the garbage disposal knob. Unfortunately it took forever - about 5 minutes per step, between each step I had to take a 15+ minute break because my drill was getting hot. It didn't really slow me down because that was the only thing I wanted to do today, but i guess it would be very annoying if he kept you at work. I was hoping to cut 2 holes with it (one for my soap dispenser) but after the first one I guess I'll wait a while and just try another step at some point.