Very impressed with this kit. It has 10 pieces including hole saws for 7/8", 1-1/8", 1-3/8", 1-3/4", 2", 2-1/2". The blades are sharp and cut fast. Easy to change the bits. I did not realize how much easier my basement project is going to be until I had this - will be able to re-route wires and clean up what prior workers had done.