Diablo's jig saw blades are designed for superior performance and longer cutting life in wood, metal and plastics. This 20 Piece set features a range of blades, including Bi-Metal for clean wood, nail-embedded wood, metal and plastics; high carbon steel for soft woods and high speed steel for metal. Each blade included in this set is optimized to deliver effortless, clean cuts. T-shank design fits all combo and most U-shank cordless and corded jig saws.