Abstract: An easy-to-use adapter assembly that will permit sanding flapper wheels of various sizes to be conveniently used in the field with portable hand held electric grinders of conventioonal design. The assembly is preferably sold as a set that includes connectors of various lengths that can accommodate drive shafts of different sizes so that the assemblage can be conveniently used in connection with flapper wheels of various thickness having spindle receiving apertures of various sizes.