These Dremel Universal Pipe & 2 x 4 Oscillating Cutting Blades are made for cutting pipes and thick materials such as 2X4 studs. With an extra wide cutting edge, the cutting blades add control and convenience because users can now easily cut PVC, conduit and copper pipe without the blade slipping off of the work-piece. They cut through a 2X4 can now be done in one pass as well. The oscillating cutting blades' bi-metal construction optimizes them for metal cutting, so you'll experience no more destroyed teeth if you hit a nail while cutting. Their dual interface allows their use with the most common oscillating tools in the market without the need of an adapter.