Genesis GAMT521 1-3/8-Inch Bi-Metal Flush Cut Blade 1-3/8-Inch wide Bi-Metal Flush Cut blade for plunge and flush cuts in nail-embedded wood, copper, aluminum, other nonferrous metals and mild steel Bi-Metal Steel construction for long life and durability when cutting metal, wood, plastic drywall and other soft material up to 1-9/16-Inch deep 21 teeth per inch Primarily used for "Cutting" with your Oscillating Tool Genesis Universal Quick-Fit Oscillating Tool Accessories fit most standard AND tool-free oscillating tools, including the popular Genesis GMT15A