Designed for fast?? coarse cuts in soft materials</br>For use in cardboard?? leathers?? carpet?? polystyrene and other soft materials</br>Made of high carbon steel</br>For most Bosch saws & others using T-shank</br></br>Product Description</br></br>BOSCH 3 pc. 4 In. Knife Ed</br><br/>http://www.amazon.com/gp/product/B001AHU5P2