You get 5 of these cutters, if you do remodeling you know they are a great tool but tend to dull quickly when using on wood, particle board or hitting nails and screws. This is the answer, a low cost alternative. They hold up well on sheet rock but regardless of manufacturer they all dull out pretty quick on plaster lath or plywood. This particular mount will not fit Dewalt cordless tools (18-60 volt). It will fit most other major brands to include most corded tool manufacturers. The list of tools this will fit include Rockwell, Milwaukee, Rigid, Skil, Bosch, Craftsman, Hitachi, Makita, Metabo and Fein. This is an oscillating multi tool Square Slot Cutter with Four Blades, Multi-Tool Single gang Electrical Wall Outlet Cutter for Plastic or Low-Voltage Electrical Boxes, Precise Cutting 2-3/8? x 3-3/4? I have included a picture of the standard 1 Gang box that these are designed for, they can also be used with low voltage rings. We also sell the boxes at the best price ! See our other listings!