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 10504228 (T234X) Wood Jigsaw Blades have progressive tooth spacing for straight, accurate cuts in thick and thin wood materials, hard and soft wood, particleboard and plywood 1-80mm.