Abstract: Backside via formation in one or more dice prior to the one or more dice being attached to an underlying substrate is described herein. The resulting backside vias having substantially no air voids or air voids occupying not greater than 8 percent of the total volume of the backside vias.

Abstract: A tube abrading tool for cleaning outer and inner surfaces of ends of pieces of copper tubing such as that employed in domestic water supply systems. The tool includes an electric motor supported in a housing. A longitudinal shaft is rotatably mounted to the motor with the opposite ends of the shaft extending beyond the periphery of the motor housing. A male abrasive member, such as a wire brush, is releasably secured to one end of the shaft and a female abrasive member, such as a wire brush, is releasably secured to the opposite end of the shaft, so that the tool is readily manipulated to clean the inside and the outside of the end of a piece of copper tubing preparatory to soldering.