Economy oscillating multitool box blade - does not fit Dewalt cordless

These are a less expensive alternative to thise high priced cutter.  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”    Each one is in a brown box.,for retail sale.