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.PTDIRW10504221