Task Tools T21739 3-1/2-Inch by 1-7/8-Inch Deep Cut Bimetal Hole Saw, 2-Piece 2-piece Bimetal hole saw for cutting metal, wood, plastic Cuts holes in steel, stainless steel, cast iron, brass, aluminum, and composite board A deep-cut design reaches through dimensional lumber with ease Extra deep tooth design for faster, smoother cuts Measures 3-1/2 inches by 1-7/8 inches (diameter by cutting depth)