Imperial Blades' One Fit" 1-3/8" Speartooth Fast Cut Wood Blade is composed of high carbon steel (HCS) for medium-duty wood applications. The newly redesigned IBOA200 Speartooth is best for aggressive material removal and cuts up to 2X faster than the previous model. Recommended applications are: Wood, PVC, Drywall and more. Popular projects include framing and construction. Not designed for metal contact. One Fit" anchor fits majority of non-Starlock multi-tools: Milwaukee, Ridgid, Ryobi, Bosch, DeWalt, Dremel, Fein, Makita, Rockwell and more.