Greenlee Variable Pitch Holesaw (1 1/8).

Cut Through Steel Tin Aluminum Fiberglass Wood And Plastic. Deep 1-5/8-Inch cutting depth allows for cutting through 2-Inch by 4-Inch wood studs. Extra-tough bi-metal blade. Steam oxide finish with no paint to gum up and slow cutting. Extra-thick back plate minimizes vibration for smoother easier less tiring cutting.