These Irwin Jigsaw Wood Cutting Blades are made from carbon steel for use in softer materials such as wood laminated chipboard and plastics They have a Universal shank with 3 sided fleam ground teeth for fast cut and clean finishes in all wood applications Fast coarse cuts in hard and soft wood plastics 5-60 mm 732Inch -2 38in Length 100mm Pitch 8 Standard Wood Cutting Packs of 5