Greenlee 825-1-1/2 Bi-Metal Hole Saw, 1-1/2-Inch 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