IRWIN 373414BX Bi-Metal Toothed Edge Hole Saw, 4.5/5.5 TPI, 4-1/4 in Dia

Each IRWIN hole saw is crafted from the highest quality bi-metal. The high speed steel teeth are welded to a carbon steel body for bi-metal construction that allows a hole saw to stay sharper longer. Because IRWIN hole saws are engineered and manufactured for exceptional sharpness and durability, they will cut a variety of materials. These saws will cut holes in wood, aluminum, copper, iron, stainless steel and zinc.