Rockwell RW8954 Extended Life Semicircle Saw Blade, 4"Highlights: Size: 4" Semi circle Bi metal Extended life For linear, plunge and flush cuts in a variety of materials such as thin wood, plastic, drywall, fiberglass, non ferrous metals, thin sheet metal, hardened fillers and window glazing Bi metal with hardened teeth to cut non ferrous metals Universal accessory fits all tools WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer