A surface abrader apparatus includes a casing, a motor mounted on the casing, one or more working tools, and an operating mechanism mounted to the casing and supporting the working tools outside of the casing. The cover is engaged with the main body, having a jointing tube protruding into the main body and two notches cut in the jointing tube. The panel includes a honeycomb core interposed between two ballistic resistant layers which are also interposed between two decorative veneers so that the panel may be incorporated into a building, furniture or other component. This current flows over the p-type channel barrier to the ntype quantum well interface, thereby causing charge to accumulate in the n-type quantum well interface.