These high quality, heat treated saw blades are designed to cut quickly and accurately with your air saw! Features include a wavy tooth pattern with up to 14 teeth per inch to provide an aggressive cut through a variety of metals, fiberglass and plastics. This assortment of shatter-resistant reciprocating saw blades are great for work on exhaust and auto bodies with your air saw! Material HCS And Bi-metal Number of pieces included 12 Number of teeth 36, 84, 30, 42, 48 Teeth per inch (TPI) 6, 14, 5-8 Arbor size 1/2 in. Blade length (in.) 6 in.