From the Manufacturer
Jig saw blades are used for a variety of applications including fine woodworking and metal cutting. The size of these blades makes them ideal for making precise, intricate cuts. Each tooth count is designed for a specific application. In general, the lower tooth counts are used for wood (up to 12 teeth-per-inch), and the higher tooth counts are used for cutting metal (14 to 36 teeth-per-inch). Please make sure that you choose the proper shank to fit your jig saw. Jig saw blades are either Universal Shank (fits most Black & Decker, Skil and DeWalt saws) or Bosch Shank (fits most Bosch and DeWalt saws). 2 pack.