These Irwin Wood Jigsaw Blades are made from Carbon steel for use in softer materials such as wood, laminated chipboard, and plastics. They have 3 Sided, fleam ground teeth for fast cut and clean finishes in all wood applications. T Shank for AEG, Bosch, DEWALT and Hitachi Jigsaws. These Irwin 10504221 (T111C) Wood Jigsaw Blades provide fast, coarse cuts in hard and soft wood, plastics 5-60mm.